diff --git a/.eslintrc.js b/.eslintrc.js
index 5b5ef73ed3806..6657ba3cb1f01 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -909,11 +909,15 @@ module.exports = {
     {
       files: [
         'x-pack/plugins/apm/**/*.{js,mjs,ts,tsx}',
-        'x-pack/plugins/observability/**/*.{js,mjs,ts,tsx}',
         'x-pack/plugins/exploratory_view/**/*.{js,mjs,ts,tsx}',
-        'x-pack/plugins/ux/**/*.{js,mjs,ts,tsx}',
-        'x-pack/plugins/synthetics/**/*.{js,mjs,ts,tsx}',
         'x-pack/plugins/infra/**/*.{js,mjs,ts,tsx}',
+        'x-pack/plugins/observability/**/*.{js,mjs,ts,tsx}',
+        'x-pack/plugins/observability_ai_assistant/**/*.{js,mjs,ts,tsx}',
+        'x-pack/plugins/observability_onboarding/**/*.{js,mjs,ts,tsx}',
+        'x-pack/plugins/observability_shared/**/*.{js,mjs,ts,tsx}',
+        'x-pack/plugins/profiling/**/*.{js,mjs,ts,tsx}',
+        'x-pack/plugins/synthetics/**/*.{js,mjs,ts,tsx}',
+        'x-pack/plugins/ux/**/*.{js,mjs,ts,tsx}',
       ],
       rules: {
         '@kbn/telemetry/event_generating_elements_should_be_instrumented': 'error',
diff --git a/packages/kbn-eslint-plugin-telemetry/helpers/check_node_for_existing_data_test_subj_prop.ts b/packages/kbn-eslint-plugin-telemetry/helpers/check_node_for_existing_data_test_subj_prop.ts
index b739dc5116c1c..ef0e32c1d2755 100644
--- a/packages/kbn-eslint-plugin-telemetry/helpers/check_node_for_existing_data_test_subj_prop.ts
+++ b/packages/kbn-eslint-plugin-telemetry/helpers/check_node_for_existing_data_test_subj_prop.ts
@@ -37,7 +37,7 @@ export function checkNodeForExistingDataTestSubjProp(
   const variable = getScope().variables.find((v) => v.name === name); // the variable definition of the spreaded variable
 
   return variable && variable.defs.length > 0
-    ? variable.defs[0].node.init.properties.find((property: TSESTree.Property) => {
+    ? variable.defs[0].node.init?.properties.find((property: TSESTree.Property) => {
         if ('value' in property.key) {
           return property.key.value === 'data-test-subj';
         }
diff --git a/packages/kbn-eslint-plugin-telemetry/rules/event_generating_elements_should_be_instrumented.test.ts b/packages/kbn-eslint-plugin-telemetry/rules/event_generating_elements_should_be_instrumented.test.ts
index c8829f05efd21..f08cfa26cbc90 100644
--- a/packages/kbn-eslint-plugin-telemetry/rules/event_generating_elements_should_be_instrumented.test.ts
+++ b/packages/kbn-eslint-plugin-telemetry/rules/event_generating_elements_should_be_instrumented.test.ts
@@ -63,7 +63,8 @@ for (const [name, tester] of [tsTester, babelTester]) {
           ],
           output: `<${element} data-test-subj="Value${element
             .replace('Eui', '')
-            .replace('Empty', '')}">Value</${element}>`,
+            .replace('Empty', '')
+            .replace('Icon', '')}">Value</${element}>`,
         })),
       }
     );
diff --git a/packages/kbn-eslint-plugin-telemetry/rules/event_generating_elements_should_be_instrumented.ts b/packages/kbn-eslint-plugin-telemetry/rules/event_generating_elements_should_be_instrumented.ts
index d2069d2845e59..7242ff1645f5e 100644
--- a/packages/kbn-eslint-plugin-telemetry/rules/event_generating_elements_should_be_instrumented.ts
+++ b/packages/kbn-eslint-plugin-telemetry/rules/event_generating_elements_should_be_instrumented.ts
@@ -17,6 +17,7 @@ import { getFunctionName } from '../helpers/get_function_name';
 export const EVENT_GENERATING_ELEMENTS = [
   'EuiButton',
   'EuiButtonEmpty',
+  'EuiButtonIcon',
   'EuiLink',
   'EuiFieldText',
   'EuiFieldSearch',
@@ -74,7 +75,7 @@ export const EventGeneratingElementsShouldBeInstrumented: Rule.RuleModule = {
         const intent = getIntentFromNode(parent);
 
         // 4. The element name that generates the events
-        const element = name.replace('Eui', '').replace('Empty', '');
+        const element = name.replace('Eui', '').replace('Empty', '').replace('Icon', '');
 
         const suggestion = `${appName}${componentName}${intent}${element}`; // 'o11yHeaderActionsSubmitButton'
 
diff --git a/x-pack/plugins/apm/public/components/app/help_popover/help_popover.tsx b/x-pack/plugins/apm/public/components/app/help_popover/help_popover.tsx
index 3a972b44f9a41..c883376cac4e1 100644
--- a/x-pack/plugins/apm/public/components/app/help_popover/help_popover.tsx
+++ b/x-pack/plugins/apm/public/components/app/help_popover/help_popover.tsx
@@ -51,6 +51,7 @@ export function HelpPopoverButton({
 
   return (
     <EuiButtonIcon
+      data-test-subj="apmHelpPopoverButtonButton"
       className="apmHelpPopover__buttonIcon"
       size="s"
       iconType="help"
diff --git a/x-pack/plugins/apm/public/components/app/onboarding/agent_config_table.tsx b/x-pack/plugins/apm/public/components/app/onboarding/agent_config_table.tsx
index 1c232f14e7187..ccbc70f4a8345 100644
--- a/x-pack/plugins/apm/public/components/app/onboarding/agent_config_table.tsx
+++ b/x-pack/plugins/apm/public/components/app/onboarding/agent_config_table.tsx
@@ -53,6 +53,7 @@ function ConfigurationValueColumn({
       </EuiText>
       {value && (
         <EuiButtonIcon
+          data-test-subj="apmConfigurationValueColumnButton"
           aria-label={i18n.translate(
             'xpack.apm.onboarding.column.value.copyIconText',
             {
diff --git a/x-pack/plugins/apm/public/components/app/onboarding/instructions/otel_agent.tsx b/x-pack/plugins/apm/public/components/app/onboarding/instructions/otel_agent.tsx
index 9ae2df7fb5382..805f2b191cbc8 100644
--- a/x-pack/plugins/apm/public/components/app/onboarding/instructions/otel_agent.tsx
+++ b/x-pack/plugins/apm/public/components/app/onboarding/instructions/otel_agent.tsx
@@ -152,6 +152,7 @@ function ConfigurationValueColumn({
       </EuiText>
       {value && (
         <EuiButtonIcon
+          data-test-subj="apmConfigurationValueColumnButton"
           aria-label={i18n.translate(
             'xpack.apm.onboarding.otel.column.value.copyIconText',
             {
diff --git a/x-pack/plugins/apm/public/components/app/settings/agent_configurations/list/index.tsx b/x-pack/plugins/apm/public/components/app/settings/agent_configurations/list/index.tsx
index 5a635b1ae92f1..285761355de00 100644
--- a/x-pack/plugins/apm/public/components/app/settings/agent_configurations/list/index.tsx
+++ b/x-pack/plugins/apm/public/components/app/settings/agent_configurations/list/index.tsx
@@ -202,6 +202,7 @@ export function AgentConfigurationList({
             name: '',
             render: (config: Config) => (
               <EuiButtonIcon
+                data-test-subj="apmColumnsButton"
                 aria-label="Edit"
                 iconType="pencil"
                 href={apmRouter.link('/settings/agent-configuration/edit', {
@@ -218,6 +219,7 @@ export function AgentConfigurationList({
             name: '',
             render: (config: Config) => (
               <EuiButtonIcon
+                data-test-subj="apmColumnsButton"
                 aria-label="Delete"
                 iconType="trash"
                 onClick={() => setConfigToBeDeleted(config)}
diff --git a/x-pack/plugins/apm/public/components/app/settings/agent_keys/create_agent_key/agent_key_callout.tsx b/x-pack/plugins/apm/public/components/app/settings/agent_keys/create_agent_key/agent_key_callout.tsx
index 7f5d83f5beb1a..535bd2ed6b4f0 100644
--- a/x-pack/plugins/apm/public/components/app/settings/agent_keys/create_agent_key/agent_key_callout.tsx
+++ b/x-pack/plugins/apm/public/components/app/settings/agent_keys/create_agent_key/agent_key_callout.tsx
@@ -58,6 +58,7 @@ export function AgentKeyCallOut({ name, token }: Props) {
             <EuiCopy textToCopy={token}>
               {(copy) => (
                 <EuiButtonIcon
+                  data-test-subj="apmAgentKeyCallOutButton"
                   iconType="copyClipboard"
                   onClick={copy}
                   color="success"
diff --git a/x-pack/plugins/apm/public/components/fleet_integration/apm_agents/runtime_attachment/discovery_rule.tsx b/x-pack/plugins/apm/public/components/fleet_integration/apm_agents/runtime_attachment/discovery_rule.tsx
index 59e87ab36f007..948e0a5d68925 100644
--- a/x-pack/plugins/apm/public/components/fleet_integration/apm_agents/runtime_attachment/discovery_rule.tsx
+++ b/x-pack/plugins/apm/public/components/fleet_integration/apm_agents/runtime_attachment/discovery_rule.tsx
@@ -99,6 +99,7 @@ export function DiscoveryRule({
               <EuiFlexGroup>
                 <EuiFlexItem grow={false}>
                   <EuiButtonIcon
+                    data-test-subj="apmDiscoveryRuleButton"
                     iconType="pencil"
                     color="primary"
                     onClick={() => {
@@ -108,6 +109,7 @@ export function DiscoveryRule({
                 </EuiFlexItem>
                 <EuiFlexItem grow={false}>
                   <EuiButtonIcon
+                    data-test-subj="apmDiscoveryRuleButton"
                     iconType="trash"
                     color="danger"
                     onClick={() => {
diff --git a/x-pack/plugins/apm/public/components/shared/popover_tooltip/index.tsx b/x-pack/plugins/apm/public/components/shared/popover_tooltip/index.tsx
index 4e119c52c8046..df3330a12c590 100644
--- a/x-pack/plugins/apm/public/components/shared/popover_tooltip/index.tsx
+++ b/x-pack/plugins/apm/public/components/shared/popover_tooltip/index.tsx
@@ -28,6 +28,7 @@ export function PopoverTooltip({
       closePopover={() => setIsPopoverOpen(false)}
       button={
         <EuiButtonIcon
+          data-test-subj="apmPopoverTooltipButton"
           aria-label={ariaLabel}
           onClick={(event: React.MouseEvent<HTMLButtonElement>) => {
             setIsPopoverOpen(!isPopoverOpen);
diff --git a/x-pack/plugins/apm/public/components/shared/span_links/span_links_table.tsx b/x-pack/plugins/apm/public/components/shared/span_links/span_links_table.tsx
index f223cf0036114..167ce52572dc8 100644
--- a/x-pack/plugins/apm/public/components/shared/span_links/span_links_table.tsx
+++ b/x-pack/plugins/apm/public/components/shared/span_links/span_links_table.tsx
@@ -142,6 +142,7 @@ export function SpanLinksTable({ items }: Props) {
           <EuiPopover
             button={
               <EuiButtonIcon
+                data-test-subj="apmColumnsButton"
                 aria-label="Edit"
                 iconType="boxesHorizontal"
                 onClick={() => {
diff --git a/x-pack/plugins/apm/public/tutorial/config_agent/opentelemetry_instructions.tsx b/x-pack/plugins/apm/public/tutorial/config_agent/opentelemetry_instructions.tsx
index 2ea2a993816b7..0b105d0550143 100644
--- a/x-pack/plugins/apm/public/tutorial/config_agent/opentelemetry_instructions.tsx
+++ b/x-pack/plugins/apm/public/tutorial/config_agent/opentelemetry_instructions.tsx
@@ -83,6 +83,7 @@ export function OpenTelemetryInstructions({
           </EuiText>
           {value && (
             <EuiButtonIcon
+              data-test-subj="apmColumnsButton"
               aria-label={i18n.translate(
                 'xpack.apm.tutorial.config_otel.column.value.copyIconText',
                 {
diff --git a/x-pack/plugins/exploratory_view/public/components/shared/exploratory_view/components/url_search/selectable_url_list.tsx b/x-pack/plugins/exploratory_view/public/components/shared/exploratory_view/components/url_search/selectable_url_list.tsx
index d7422c35ebacf..714b8bd629e44 100644
--- a/x-pack/plugins/exploratory_view/public/components/shared/exploratory_view/components/url_search/selectable_url_list.tsx
+++ b/x-pack/plugins/exploratory_view/public/components/shared/exploratory_view/components/url_search/selectable_url_list.tsx
@@ -136,6 +136,7 @@ export function SelectableUrlList({
           </EuiFlexItem>
           <EuiFlexItem grow={false}>
             <EuiButtonIcon
+              data-test-subj="exploratoryViewPopOverTitleButton"
               color="text"
               onClick={() => closePopover()}
               aria-label={i18n.translate('xpack.exploratoryView.search.url.close', {
diff --git a/x-pack/plugins/exploratory_view/public/components/shared/exploratory_view/series_editor/columns/series_actions.tsx b/x-pack/plugins/exploratory_view/public/components/shared/exploratory_view/series_editor/columns/series_actions.tsx
index a2e78fb36c41f..fec7360b253f2 100644
--- a/x-pack/plugins/exploratory_view/public/components/shared/exploratory_view/series_editor/columns/series_actions.tsx
+++ b/x-pack/plugins/exploratory_view/public/components/shared/exploratory_view/series_editor/columns/series_actions.tsx
@@ -72,6 +72,7 @@ export function SeriesActions({ seriesId, series, seriesConfig, onEditClick }: P
 
   const popoverButton = (
     <EuiButtonIcon
+      data-test-subj="exploratoryViewSeriesActionsButton"
       iconType="boxesHorizontal"
       onClick={changePopoverVisibility}
       color="text"
diff --git a/x-pack/plugins/exploratory_view/public/components/shared/exploratory_view/series_editor/columns/series_name.tsx b/x-pack/plugins/exploratory_view/public/components/shared/exploratory_view/series_editor/columns/series_name.tsx
index ad2b1c1823f04..1d5c9892c4db1 100644
--- a/x-pack/plugins/exploratory_view/public/components/shared/exploratory_view/series_editor/columns/series_name.tsx
+++ b/x-pack/plugins/exploratory_view/public/components/shared/exploratory_view/series_editor/columns/series_name.tsx
@@ -101,6 +101,7 @@ export function SeriesName({ series, seriesId }: Props) {
       )}
       <EuiFlexItem grow={false}>
         <EuiButtonIcon
+          data-test-subj="exploratoryViewSeriesNameButton"
           onClick={() => setIsEditingEnabled(!isEditingEnabled)}
           iconType="pencil"
           aria-label={i18n.translate('xpack.exploratoryView.expView.seriesEditor.editName', {
diff --git a/x-pack/plugins/infra/public/alerting/inventory/components/expression.tsx b/x-pack/plugins/infra/public/alerting/inventory/components/expression.tsx
index f06335145877d..340c00b9f48cc 100644
--- a/x-pack/plugins/infra/public/alerting/inventory/components/expression.tsx
+++ b/x-pack/plugins/infra/public/alerting/inventory/components/expression.tsx
@@ -578,6 +578,7 @@ export const ExpressionRow: React.FC<ExpressionRowProps> = (props) => {
       <EuiFlexGroup gutterSize="xs">
         <EuiFlexItem grow={false}>
           <EuiButtonIcon
+            data-test-subj="infraExpressionRowButton"
             iconType={isExpanded ? 'arrowDown' : 'arrowRight'}
             onClick={toggle}
             aria-label={i18n.translate('xpack.infra.metrics.alertFlyout.expandRowLabel', {
@@ -629,6 +630,7 @@ export const ExpressionRow: React.FC<ExpressionRowProps> = (props) => {
                   />
                 </StyledHealth>
                 <EuiButtonIcon
+                  data-test-subj="infraExpressionRowButton"
                   aria-label={i18n.translate(
                     'xpack.infra.metrics.alertFlyout.removeWarningThreshold',
                     {
@@ -668,6 +670,7 @@ export const ExpressionRow: React.FC<ExpressionRowProps> = (props) => {
         {canDelete && (
           <EuiFlexItem grow={false}>
             <EuiButtonIcon
+              data-test-subj="infraExpressionRowButton"
               aria-label={i18n.translate('xpack.infra.metrics.alertFlyout.removeCondition', {
                 defaultMessage: 'Remove condition',
               })}
diff --git a/x-pack/plugins/infra/public/alerting/inventory/components/metric.tsx b/x-pack/plugins/infra/public/alerting/inventory/components/metric.tsx
index 5d96a80da652a..d6704ce6c2b89 100644
--- a/x-pack/plugins/infra/public/alerting/inventory/components/metric.tsx
+++ b/x-pack/plugins/infra/public/alerting/inventory/components/metric.tsx
@@ -330,6 +330,7 @@ export const ClosablePopoverTitle = ({ children, onClose }: ClosablePopoverTitle
         <EuiFlexItem>{children}</EuiFlexItem>
         <EuiFlexItem grow={false}>
           <EuiButtonIcon
+            data-test-subj="infraClosablePopoverTitleButton"
             iconType="cross"
             color="danger"
             aria-label={i18n.translate(
diff --git a/x-pack/plugins/infra/public/alerting/inventory/components/node_type.tsx b/x-pack/plugins/infra/public/alerting/inventory/components/node_type.tsx
index 530743d95541c..1f07c314b3b2a 100644
--- a/x-pack/plugins/infra/public/alerting/inventory/components/node_type.tsx
+++ b/x-pack/plugins/infra/public/alerting/inventory/components/node_type.tsx
@@ -98,6 +98,7 @@ export const ClosablePopoverTitle = ({ children, onClose }: ClosablePopoverTitle
         <EuiFlexItem>{children}</EuiFlexItem>
         <EuiFlexItem grow={false}>
           <EuiButtonIcon
+            data-test-subj="infraClosablePopoverTitleButton"
             iconType="cross"
             color="danger"
             aria-label={i18n.translate(
diff --git a/x-pack/plugins/infra/public/alerting/log_threshold/components/expression_editor/criterion.tsx b/x-pack/plugins/infra/public/alerting/log_threshold/components/expression_editor/criterion.tsx
index f2bb1d8ed5785..1f0c82310da45 100644
--- a/x-pack/plugins/infra/public/alerting/log_threshold/components/expression_editor/criterion.tsx
+++ b/x-pack/plugins/infra/public/alerting/log_threshold/components/expression_editor/criterion.tsx
@@ -295,6 +295,7 @@ export const Criterion: React.FC<Props> = ({
       {canDelete && (
         <EuiFlexItem grow={false}>
           <EuiButtonIcon
+            data-test-subj="infraCriterionButton"
             aria-label={i18n.translate('xpack.infra.logs.alertFlyout.removeCondition', {
               defaultMessage: 'Remove condition',
             })}
diff --git a/x-pack/plugins/infra/public/alerting/metric_anomaly/components/node_type.tsx b/x-pack/plugins/infra/public/alerting/metric_anomaly/components/node_type.tsx
index fe43db40a41e5..a3cfbc978388a 100644
--- a/x-pack/plugins/infra/public/alerting/metric_anomaly/components/node_type.tsx
+++ b/x-pack/plugins/infra/public/alerting/metric_anomaly/components/node_type.tsx
@@ -100,6 +100,7 @@ export const ClosablePopoverTitle = ({ children, onClose }: ClosablePopoverTitle
         <EuiFlexItem>{children}</EuiFlexItem>
         <EuiFlexItem grow={false}>
           <EuiButtonIcon
+            data-test-subj="infraClosablePopoverTitleButton"
             iconType="cross"
             color="danger"
             aria-label={i18n.translate(
diff --git a/x-pack/plugins/infra/public/alerting/metric_anomaly/components/severity_threshold.tsx b/x-pack/plugins/infra/public/alerting/metric_anomaly/components/severity_threshold.tsx
index f0de1d0d30e7e..d910de567a1e9 100644
--- a/x-pack/plugins/infra/public/alerting/metric_anomaly/components/severity_threshold.tsx
+++ b/x-pack/plugins/infra/public/alerting/metric_anomaly/components/severity_threshold.tsx
@@ -123,6 +123,7 @@ export const ClosablePopoverTitle = ({ children, onClose }: ClosablePopoverTitle
         <EuiFlexItem>{children}</EuiFlexItem>
         <EuiFlexItem grow={false}>
           <EuiButtonIcon
+            data-test-subj="infraClosablePopoverTitleButton"
             iconType="cross"
             color="danger"
             aria-label={i18n.translate(
diff --git a/x-pack/plugins/infra/public/alerting/metric_threshold/components/custom_equation/metric_row_controls.tsx b/x-pack/plugins/infra/public/alerting/metric_threshold/components/custom_equation/metric_row_controls.tsx
index 3c8efe19a01d7..6145a0dbec9bc 100644
--- a/x-pack/plugins/infra/public/alerting/metric_threshold/components/custom_equation/metric_row_controls.tsx
+++ b/x-pack/plugins/infra/public/alerting/metric_threshold/components/custom_equation/metric_row_controls.tsx
@@ -18,6 +18,7 @@ export const MetricRowControls = ({ onDelete, disableDelete }: MetricRowControlP
     <>
       <EuiFlexItem grow={0}>
         <EuiButtonIcon
+          data-test-subj="infraMetricRowControlsButton"
           iconType="trash"
           color="danger"
           style={{ marginBottom: '0.2em' }}
diff --git a/x-pack/plugins/infra/public/alerting/metric_threshold/components/expression_row.tsx b/x-pack/plugins/infra/public/alerting/metric_threshold/components/expression_row.tsx
index 3a59108e7e4d8..b26f057dd9853 100644
--- a/x-pack/plugins/infra/public/alerting/metric_threshold/components/expression_row.tsx
+++ b/x-pack/plugins/infra/public/alerting/metric_threshold/components/expression_row.tsx
@@ -316,6 +316,7 @@ export const ExpressionRow: React.FC<ExpressionRowProps> = (props) => {
                   />
                 </StyledHealth>
                 <EuiButtonIcon
+                  data-test-subj="infraExpressionRowButton"
                   aria-label={i18n.translate(
                     'xpack.infra.metrics.alertFlyout.removeWarningThreshold',
                     {
@@ -350,6 +351,7 @@ export const ExpressionRow: React.FC<ExpressionRowProps> = (props) => {
         {canDelete && (
           <EuiFlexItem grow={false}>
             <EuiButtonIcon
+              data-test-subj="infraExpressionRowButton"
               aria-label={i18n.translate('xpack.infra.metrics.alertFlyout.removeCondition', {
                 defaultMessage: 'Remove condition',
               })}
diff --git a/x-pack/plugins/infra/public/components/basic_table/row_expansion_button.tsx b/x-pack/plugins/infra/public/components/basic_table/row_expansion_button.tsx
index 7b046e9f2d252..fc150509512bd 100644
--- a/x-pack/plugins/infra/public/components/basic_table/row_expansion_button.tsx
+++ b/x-pack/plugins/infra/public/components/basic_table/row_expansion_button.tsx
@@ -27,6 +27,7 @@ export const RowExpansionButton = <Item extends any>({
 
   return (
     <EuiButtonIcon
+      data-test-subj="infraRowExpansionButtonButton"
       onClick={handleClick}
       aria-label={isExpanded ? collapseAriaLabel : expandAriaLabel}
       iconType={isExpanded ? 'arrowUp' : 'arrowDown'}
diff --git a/x-pack/plugins/infra/public/components/logging/log_highlights_menu.tsx b/x-pack/plugins/infra/public/components/logging/log_highlights_menu.tsx
index 3d4c2cd2c3c0e..a3e0774ff209d 100644
--- a/x-pack/plugins/infra/public/components/logging/log_highlights_menu.tsx
+++ b/x-pack/plugins/infra/public/components/logging/log_highlights_menu.tsx
@@ -114,6 +114,7 @@ export const LogHighlightsMenu: React.FC<LogHighlightsMenuProps> = ({
           </EuiFlexItem>
           <EuiFlexItem grow={false}>
             <EuiButtonIcon
+              data-test-subj="infraLogHighlightsMenuButton"
               aria-label={goToPreviousHighlightLabel}
               iconType="arrowUp"
               onClick={goToPreviousHighlight}
@@ -123,6 +124,7 @@ export const LogHighlightsMenu: React.FC<LogHighlightsMenuProps> = ({
           </EuiFlexItem>
           <EuiFlexItem grow={false}>
             <EuiButtonIcon
+              data-test-subj="infraLogHighlightsMenuButton"
               aria-label={goToNextHighlightLabel}
               iconType="arrowDown"
               onClick={goToNextHighlight}
@@ -132,6 +134,7 @@ export const LogHighlightsMenu: React.FC<LogHighlightsMenuProps> = ({
           </EuiFlexItem>
           <EuiFlexItem grow={false}>
             <EuiButtonIcon
+              data-test-subj="infraLogHighlightsMenuButton"
               aria-label={clearTermsButtonLabel}
               color="danger"
               isDisabled={highlightTerm === ''}
diff --git a/x-pack/plugins/infra/public/containers/react_query_provider.tsx b/x-pack/plugins/infra/public/containers/react_query_provider.tsx
index 050575dcc054a..ee49e9cd081e0 100644
--- a/x-pack/plugins/infra/public/containers/react_query_provider.tsx
+++ b/x-pack/plugins/infra/public/containers/react_query_provider.tsx
@@ -39,6 +39,7 @@ function HideableReactQueryDevTools() {
   return !isHidden ? (
     <div>
       <EuiButtonIcon
+        data-test-subj="infraHideableReactQueryDevToolsButton"
         iconType="cross"
         color="primary"
         style={{ zIndex: 99999, position: 'fixed', bottom: '40px', left: '40px' }}
diff --git a/x-pack/plugins/infra/public/pages/logs/log_entry_rate/sections/anomalies/table.tsx b/x-pack/plugins/infra/public/pages/logs/log_entry_rate/sections/anomalies/table.tsx
index e342e538b1433..1e1f720a1ad67 100644
--- a/x-pack/plugins/infra/public/pages/logs/log_entry_rate/sections/anomalies/table.tsx
+++ b/x-pack/plugins/infra/public/pages/logs/log_entry_rate/sections/anomalies/table.tsx
@@ -299,6 +299,7 @@ const PaginationControls = ({
       <EuiFlexItem grow={false}>
         <EuiFlexGroup>
           <EuiButtonIcon
+            data-test-subj="infraPaginationControlsButton"
             iconType="arrowLeft"
             isDisabled={!fetchPreviousPage || isLoading}
             onClick={fetchPreviousPage}
@@ -308,6 +309,7 @@ const PaginationControls = ({
             <strong>{page}</strong>
           </span>
           <EuiButtonIcon
+            data-test-subj="infraPaginationControlsButton"
             iconType="arrowRight"
             isDisabled={!fetchNextPage || isLoading}
             onClick={fetchNextPage}
diff --git a/x-pack/plugins/infra/public/pages/metrics/inventory_view/components/ml/anomaly_detection/anomalies_table/anomalies_table.tsx b/x-pack/plugins/infra/public/pages/metrics/inventory_view/components/ml/anomaly_detection/anomalies_table/anomalies_table.tsx
index 3f1f5e016c5b5..f2dc777ba792b 100644
--- a/x-pack/plugins/infra/public/pages/metrics/inventory_view/components/ml/anomaly_detection/anomalies_table/anomalies_table.tsx
+++ b/x-pack/plugins/infra/public/pages/metrics/inventory_view/components/ml/anomaly_detection/anomalies_table/anomalies_table.tsx
@@ -146,6 +146,7 @@ const AnomalyActionMenu = ({
         panelPaddingSize="none"
         button={
           <EuiButtonIcon
+            data-test-subj="infraAnomalyActionMenuButton"
             iconType="boxesHorizontal"
             onClick={handleToggleMenu}
             aria-label={i18n.translate('xpack.infra.ml.anomalyFlyout.actions.openActionMenu', {
diff --git a/x-pack/plugins/infra/public/pages/metrics/inventory_view/components/ml/anomaly_detection/anomalies_table/pagination.tsx b/x-pack/plugins/infra/public/pages/metrics/inventory_view/components/ml/anomaly_detection/anomalies_table/pagination.tsx
index 322a29a129a12..dfde978da61a0 100644
--- a/x-pack/plugins/infra/public/pages/metrics/inventory_view/components/ml/anomaly_detection/anomalies_table/pagination.tsx
+++ b/x-pack/plugins/infra/public/pages/metrics/inventory_view/components/ml/anomaly_detection/anomalies_table/pagination.tsx
@@ -36,6 +36,7 @@ export const PaginationControls = ({
       <EuiFlexItem grow={false}>
         <EuiFlexGroup>
           <EuiButtonIcon
+            data-test-subj="infraPaginationControlsButton"
             iconType="arrowLeft"
             isDisabled={!fetchPreviousPage || isLoading}
             onClick={fetchPreviousPage}
@@ -45,6 +46,7 @@ export const PaginationControls = ({
             <strong>{page}</strong>
           </span>
           <EuiButtonIcon
+            data-test-subj="infraPaginationControlsButton"
             iconType="arrowRight"
             isDisabled={!fetchNextPage || isLoading}
             onClick={fetchNextPage}
diff --git a/x-pack/plugins/infra/public/pages/metrics/inventory_view/components/node_details/overlay.tsx b/x-pack/plugins/infra/public/pages/metrics/inventory_view/components/node_details/overlay.tsx
index ed2f3bc7cba1d..ef69c1d104062 100644
--- a/x-pack/plugins/infra/public/pages/metrics/inventory_view/components/node_details/overlay.tsx
+++ b/x-pack/plugins/infra/public/pages/metrics/inventory_view/components/node_details/overlay.tsx
@@ -148,7 +148,12 @@ export const NodeContextPopover = ({
                     </EuiButtonEmpty>
                   </EuiFlexItem>
                   <EuiFlexItem grow={false}>
-                    <EuiButtonIcon size="s" onClick={onClose} iconType="cross" />
+                    <EuiButtonIcon
+                      data-test-subj="infraNodeContextPopoverButton"
+                      size="s"
+                      onClick={onClose}
+                      iconType="cross"
+                    />
                   </EuiFlexItem>
                 </EuiFlexGroup>
               </EuiFlexItem>
diff --git a/x-pack/plugins/infra/public/pages/metrics/inventory_view/components/node_details/tabs/properties/table.tsx b/x-pack/plugins/infra/public/pages/metrics/inventory_view/components/node_details/tabs/properties/table.tsx
index 197e0ae1cb2a1..01b047f2e3664 100644
--- a/x-pack/plugins/infra/public/pages/metrics/inventory_view/components/node_details/tabs/properties/table.tsx
+++ b/x-pack/plugins/infra/public/pages/metrics/inventory_view/components/node_details/tabs/properties/table.tsx
@@ -65,6 +65,7 @@ export const Table = (props: Props) => {
                     )}
                   >
                     <EuiButtonIcon
+                      data-test-subj="infraColumnsButton"
                       color="text"
                       size="s"
                       iconType="filter"
diff --git a/x-pack/plugins/infra/public/pages/metrics/inventory_view/components/waffle/metric_control/metrics_edit_mode.tsx b/x-pack/plugins/infra/public/pages/metrics/inventory_view/components/waffle/metric_control/metrics_edit_mode.tsx
index 8ea98859b2c16..fddd37e2b2803 100644
--- a/x-pack/plugins/infra/public/pages/metrics/inventory_view/components/waffle/metric_control/metrics_edit_mode.tsx
+++ b/x-pack/plugins/infra/public/pages/metrics/inventory_view/components/waffle/metric_control/metrics_edit_mode.tsx
@@ -39,6 +39,7 @@ export const MetricsEditMode = withTheme(
           >
             <EuiFlexItem grow={false} style={{ width: ICON_WIDTH }}>
               <EuiButtonIcon
+                data-test-subj="infraMetricsEditModeButton"
                 iconType="pencil"
                 onClick={() => onEdit(metric)}
                 aria-label={i18n.translate(
@@ -55,6 +56,7 @@ export const MetricsEditMode = withTheme(
             </EuiFlexItem>
             <EuiFlexItem grow={false} style={{ width: ICON_WIDTH, textAlign: 'right' }}>
               <EuiButtonIcon
+                data-test-subj="infraMetricsEditModeButton"
                 iconType="trash"
                 color="danger"
                 onClick={() => onDelete(metric)}
diff --git a/x-pack/plugins/infra/public/pages/metrics/metric_detail/components/metadata_details.tsx b/x-pack/plugins/infra/public/pages/metrics/metric_detail/components/metadata_details.tsx
index edd760bc17f64..e1596f52aa3c3 100644
--- a/x-pack/plugins/infra/public/pages/metrics/metric_detail/components/metadata_details.tsx
+++ b/x-pack/plugins/infra/public/pages/metrics/metric_detail/components/metadata_details.tsx
@@ -142,6 +142,7 @@ export const MetadataDetails = (props: Props) => {
       {filteredFields.length > NUMBER_OF_COLUMNS ? (
         <Controls>
           <EuiButtonIcon
+            data-test-subj="infraMetadataDetailsButton"
             iconType={isOpen ? 'arrowUp' : 'arrowDown'}
             onClick={toggleIsOpen}
             aria-label={i18n.translate('xpack.infra.nodeDetails.labels.showMoreDetails', {
diff --git a/x-pack/plugins/observability/public/components/threshold/components/closable_popover_title.tsx b/x-pack/plugins/observability/public/components/threshold/components/closable_popover_title.tsx
index 7fe5d73783011..1caa7c82940aa 100644
--- a/x-pack/plugins/observability/public/components/threshold/components/closable_popover_title.tsx
+++ b/x-pack/plugins/observability/public/components/threshold/components/closable_popover_title.tsx
@@ -21,6 +21,7 @@ export function ClosablePopoverTitle({ children, onClose }: ClosablePopoverTitle
         <EuiFlexItem>{children}</EuiFlexItem>
         <EuiFlexItem grow={false}>
           <EuiButtonIcon
+            data-test-subj="o11yClosablePopoverTitleButton"
             iconType="cross"
             color="danger"
             aria-label={i18n.translate(
diff --git a/x-pack/plugins/observability/public/components/threshold/components/custom_equation/metric_row_controls.tsx b/x-pack/plugins/observability/public/components/threshold/components/custom_equation/metric_row_controls.tsx
index 5f4ebac04cd34..d43c09d7c3787 100644
--- a/x-pack/plugins/observability/public/components/threshold/components/custom_equation/metric_row_controls.tsx
+++ b/x-pack/plugins/observability/public/components/threshold/components/custom_equation/metric_row_controls.tsx
@@ -18,6 +18,7 @@ export function MetricRowControls({ onDelete, disableDelete }: MetricRowControlP
     <>
       <EuiFlexItem grow={0}>
         <EuiButtonIcon
+          data-test-subj="o11yMetricRowControlsButton"
           aria-label={DELETE_LABEL}
           iconType="trash"
           color="danger"
diff --git a/x-pack/plugins/observability/public/components/threshold/components/expression_row.tsx b/x-pack/plugins/observability/public/components/threshold/components/expression_row.tsx
index ac8a4a05092d4..df8c7916ecba7 100644
--- a/x-pack/plugins/observability/public/components/threshold/components/expression_row.tsx
+++ b/x-pack/plugins/observability/public/components/threshold/components/expression_row.tsx
@@ -173,6 +173,7 @@ export const ExpressionRow: React.FC<ExpressionRowProps> = (props) => {
         {canDelete && (
           <EuiFlexItem grow={false}>
             <EuiButtonIcon
+              data-test-subj="o11yExpressionRowButton"
               aria-label={i18n.translate(
                 'xpack.observability.threshold.rule.alertFlyout.removeCondition',
                 {
diff --git a/x-pack/plugins/observability/public/pages/alerts/components/alert_actions.tsx b/x-pack/plugins/observability/public/pages/alerts/components/alert_actions.tsx
index 14afd4994b2be..1ba58e56aa77e 100644
--- a/x-pack/plugins/observability/public/pages/alerts/components/alert_actions.tsx
+++ b/x-pack/plugins/observability/public/pages/alerts/components/alert_actions.tsx
@@ -216,6 +216,7 @@ export function AlertActions({
             })}
           >
             <EuiButtonIcon
+              data-test-subj="o11yAlertActionsButton"
               aria-label={i18n.translate('xpack.observability.alertsTable.viewInAppTextLabel', {
                 defaultMessage: 'View in app',
               })}
diff --git a/x-pack/plugins/observability/public/pages/overview/components/sections/ux/core_web_vitals/web_core_vitals_title.tsx b/x-pack/plugins/observability/public/pages/overview/components/sections/ux/core_web_vitals/web_core_vitals_title.tsx
index 9c2904638c281..a14ce837bad07 100644
--- a/x-pack/plugins/observability/public/pages/overview/components/sections/ux/core_web_vitals/web_core_vitals_title.tsx
+++ b/x-pack/plugins/observability/public/pages/overview/components/sections/ux/core_web_vitals/web_core_vitals_title.tsx
@@ -62,6 +62,7 @@ export function WebCoreVitalsTitle({
               isOpen={isPopoverOpen}
               button={
                 <EuiButtonIcon
+                  data-test-subj="o11yWebCoreVitalsTitleButton"
                   aria-label={helpAriaLabel}
                   onClick={() => setIsPopoverOpen(true)}
                   color={'text'}
@@ -110,6 +111,7 @@ export function WebCoreVitalsTitle({
                 isOpen={isBrowserPopoverOpen}
                 button={
                   <EuiButtonIcon
+                    data-test-subj="o11yWebCoreVitalsTitleButton"
                     aria-label={helpAriaLabel}
                     onClick={() => setIsBrowserPopoverOpen(true)}
                     color={'text'}
diff --git a/x-pack/plugins/observability/public/pages/slo_edit/components/custom_metric/metric_indicator.tsx b/x-pack/plugins/observability/public/pages/slo_edit/components/custom_metric/metric_indicator.tsx
index f451d5d98007c..a333a353f97d9 100644
--- a/x-pack/plugins/observability/public/pages/slo_edit/components/custom_metric/metric_indicator.tsx
+++ b/x-pack/plugins/observability/public/pages/slo_edit/components/custom_metric/metric_indicator.tsx
@@ -213,6 +213,7 @@ export function MetricIndicator({ type, indexFields, isLoadingIndex }: MetricInd
             </EuiFlexItem>
             <EuiFlexItem grow={0}>
               <EuiButtonIcon
+                data-test-subj="o11yMetricIndicatorButton"
                 iconType="trash"
                 color="danger"
                 style={{ marginTop: '1.5em' }}
diff --git a/x-pack/plugins/observability/public/pages/slos/components/slo_list_item.tsx b/x-pack/plugins/observability/public/pages/slos/components/slo_list_item.tsx
index 72656db6dcdc4..7ad4bb1f2ffad 100644
--- a/x-pack/plugins/observability/public/pages/slos/components/slo_list_item.tsx
+++ b/x-pack/plugins/observability/public/pages/slos/components/slo_list_item.tsx
@@ -178,6 +178,7 @@ export function SloListItem({
             anchorPosition="downLeft"
             button={
               <EuiButtonIcon
+                data-test-subj="o11ySloListItemButton"
                 aria-label={i18n.translate('xpack.observability.slo.item.actions.button', {
                   defaultMessage: 'Actions',
                 })}
diff --git a/x-pack/plugins/observability_ai_assistant/public/functions/lens.tsx b/x-pack/plugins/observability_ai_assistant/public/functions/lens.tsx
index efacbe07816e1..aab0b6aa4ac59 100644
--- a/x-pack/plugins/observability_ai_assistant/public/functions/lens.tsx
+++ b/x-pack/plugins/observability_ai_assistant/public/functions/lens.tsx
@@ -89,6 +89,7 @@ function Lens({
           <EuiFlexGroup direction="row" gutterSize="s" justifyContent="flexEnd">
             <EuiFlexItem grow={false}>
               <EuiButton
+                data-test-subj="observabilityAiAssistantLensOpenInLensButton"
                 iconType="lensApp"
                 onClick={() => {
                   lens.navigateToPrefilledEditor(lensEmbeddableInput);
@@ -101,6 +102,7 @@ function Lens({
             </EuiFlexItem>
             <EuiFlexItem grow={false}>
               <EuiButton
+                data-test-subj="observabilityAiAssistantLensSaveButton"
                 iconType="save"
                 onClick={() => {
                   setIsSaveModalOpen(() => true);
diff --git a/x-pack/plugins/observability_onboarding/public/components/app/custom_logs/wizard/api_key_banner.tsx b/x-pack/plugins/observability_onboarding/public/components/app/custom_logs/wizard/api_key_banner.tsx
index c55f554fc4845..b0d6b5f9e6c26 100644
--- a/x-pack/plugins/observability_onboarding/public/components/app/custom_logs/wizard/api_key_banner.tsx
+++ b/x-pack/plugins/observability_onboarding/public/components/app/custom_logs/wizard/api_key_banner.tsx
@@ -93,6 +93,7 @@ export function ApiKeyBanner({
           <EuiCopy textToCopy={payload?.apiKeyEncoded ?? ''}>
             {(copy) => (
               <EuiButtonIcon
+                data-test-subj="observabilityOnboardingApiKeySuccessCalloutButton"
                 iconType="copyClipboard"
                 onClick={copy}
                 color="success"
diff --git a/x-pack/plugins/observability_onboarding/public/components/app/custom_logs/wizard/back_button.tsx b/x-pack/plugins/observability_onboarding/public/components/app/custom_logs/wizard/back_button.tsx
index 16be8f65e0099..23afda21ef6be 100644
--- a/x-pack/plugins/observability_onboarding/public/components/app/custom_logs/wizard/back_button.tsx
+++ b/x-pack/plugins/observability_onboarding/public/components/app/custom_logs/wizard/back_button.tsx
@@ -17,6 +17,7 @@ export function BackButton({ onBack }: { onBack: () => void }) {
 
   return (
     <EuiButtonEmpty
+      data-test-subj="observabilityOnboardingBackButtonBackButton"
       iconType="arrowLeft"
       color="primary"
       onClick={onBack}
diff --git a/x-pack/plugins/observability_onboarding/public/components/app/custom_logs/wizard/configure_logs.tsx b/x-pack/plugins/observability_onboarding/public/components/app/custom_logs/wizard/configure_logs.tsx
index a29286f84336a..cb17a5fa68a4d 100644
--- a/x-pack/plugins/observability_onboarding/public/components/app/custom_logs/wizard/configure_logs.tsx
+++ b/x-pack/plugins/observability_onboarding/public/components/app/custom_logs/wizard/configure_logs.tsx
@@ -174,6 +174,7 @@ export function ConfigureLogs() {
           items={[
             <BackButton onBack={goBack} />,
             <EuiButton
+              data-test-subj="observabilityOnboardingConfigureLogsButton"
               color="primary"
               fill
               onClick={onContinue}
@@ -234,6 +235,7 @@ export function ConfigureLogs() {
                   <EuiFlexGroup alignItems="center" gutterSize="xs">
                     <EuiFlexItem>
                       <EuiFieldText
+                        data-test-subj="observabilityOnboardingConfigureLogsFieldText"
                         placeholder={i18n.translate(
                           'xpack.observability_onboarding.configureLogs.logFile.placeholder',
                           {
@@ -247,6 +249,7 @@ export function ConfigureLogs() {
                     {index > 0 && (
                       <EuiFlexItem grow={false}>
                         <EuiButtonIcon
+                          data-test-subj="observabilityOnboardingConfigureLogsButton"
                           iconType="trash"
                           aria-label="Delete"
                           onClick={() => removeLogFilePath(index)}
@@ -265,7 +268,11 @@ export function ConfigureLogs() {
             gutterSize="xs"
           >
             <EuiFlexItem grow={false}>
-              <EuiButtonEmpty iconType="plusInCircle" onClick={addLogFilePath}>
+              <EuiButtonEmpty
+                data-test-subj="observabilityOnboardingConfigureLogsAddRowButton"
+                iconType="plusInCircle"
+                onClick={addLogFilePath}
+              >
                 {i18n.translate(
                   'xpack.observability_onboarding.configureLogs.logFile.addRow',
                   {
@@ -313,6 +320,7 @@ export function ConfigureLogs() {
             }
           >
             <EuiFieldText
+              data-test-subj="observabilityOnboardingConfigureLogsFieldText"
               placeholder={i18n.translate(
                 'xpack.observability_onboarding.configureLogs.serviceName.placeholder',
                 {
@@ -387,6 +395,7 @@ export function ConfigureLogs() {
                       values={{
                         learnMoreLink: (
                           <EuiLink
+                            data-test-subj="observabilityOnboardingConfigureLogsLearnMoreLink"
                             external
                             target="_blank"
                             href={
@@ -406,6 +415,7 @@ export function ConfigureLogs() {
                   }
                 >
                   <EuiFieldText
+                    data-test-subj="observabilityOnboardingConfigureLogsFieldText"
                     placeholder={i18n.translate(
                       'xpack.observability_onboarding.configureLogs.namespace.placeholder',
                       {
@@ -431,6 +441,7 @@ export function ConfigureLogs() {
                       values={{
                         learnMoreLink: (
                           <EuiLink
+                            data-test-subj="observabilityOnboardingConfigureLogsLearnMoreLink"
                             external
                             target="_blank"
                             href={
@@ -450,6 +461,7 @@ export function ConfigureLogs() {
                   }
                 >
                   <EuiTextArea
+                    data-test-subj="observabilityOnboardingConfigureLogsTextArea"
                     value={customConfigurations}
                     onChange={(event) =>
                       setCustomConfigurations(event.target.value)
@@ -514,6 +526,7 @@ export function ConfigureLogs() {
             error={integrationNameError}
           >
             <EuiFieldText
+              data-test-subj="observabilityOnboardingConfigureLogsFieldText"
               placeholder={i18n.translate(
                 'xpack.observability_onboarding.configureLogs.integration.placeholder',
                 {
@@ -568,6 +581,7 @@ export function ConfigureLogs() {
             error={datasetNameError}
           >
             <EuiFieldText
+              data-test-subj="observabilityOnboardingConfigureLogsFieldText"
               placeholder={i18n.translate(
                 'xpack.observability_onboarding.configureLogs.dataset.placeholder',
                 {
diff --git a/x-pack/plugins/observability_onboarding/public/components/app/custom_logs/wizard/install_elastic_agent.tsx b/x-pack/plugins/observability_onboarding/public/components/app/custom_logs/wizard/install_elastic_agent.tsx
index 184ef62d81277..041ec786697c0 100644
--- a/x-pack/plugins/observability_onboarding/public/components/app/custom_logs/wizard/install_elastic_agent.tsx
+++ b/x-pack/plugins/observability_onboarding/public/components/app/custom_logs/wizard/install_elastic_agent.tsx
@@ -233,7 +233,10 @@ export function InstallElasticAgent() {
             <BackButton onBack={goBack} />,
             <EuiFlexGroup justifyContent="flexEnd" alignItems="center">
               <EuiFlexItem grow={false}>
-                <EuiButtonEmpty onClick={onInspect}>
+                <EuiButtonEmpty
+                  data-test-subj="observabilityOnboardingInstallElasticAgentInspectButton"
+                  onClick={onInspect}
+                >
                   {i18n.translate(
                     'xpack.observability_onboarding.steps.inspect',
                     { defaultMessage: 'Inspect' }
@@ -242,6 +245,7 @@ export function InstallElasticAgent() {
               </EuiFlexItem>
               <EuiFlexItem grow={false}>
                 <EuiButton
+                  data-test-subj="observabilityOnboardingInstallElasticAgentExploreLogsButton"
                   color="success"
                   fill
                   iconType="magnifyWithPlus"
diff --git a/x-pack/plugins/observability_onboarding/public/components/app/custom_logs/wizard/select_logs.tsx b/x-pack/plugins/observability_onboarding/public/components/app/custom_logs/wizard/select_logs.tsx
index b1a7569255007..d0712346c1b61 100644
--- a/x-pack/plugins/observability_onboarding/public/components/app/custom_logs/wizard/select_logs.tsx
+++ b/x-pack/plugins/observability_onboarding/public/components/app/custom_logs/wizard/select_logs.tsx
@@ -48,7 +48,11 @@ export function SelectLogs() {
       panelFooter={
         <StepPanelFooter
           items={[
-            <EuiButton color="text" onClick={onBack}>
+            <EuiButton
+              data-test-subj="observabilityOnboardingSelectLogsBackButton"
+              color="text"
+              onClick={onBack}
+            >
               {i18n.translate('xpack.observability_onboarding.steps.back', {
                 defaultMessage: 'Back',
               })}
@@ -183,6 +187,7 @@ export function SelectLogs() {
           </EuiFlexGroup>
           <EuiSpacer size="m" />
           <EuiLink
+            data-test-subj="observabilityOnboardingSelectLogsExploreOtherIntegrationsLink"
             href="#"
             target="_blank"
             onClick={(event: MouseEvent) => {
diff --git a/x-pack/plugins/observability_onboarding/public/components/app/home/index.tsx b/x-pack/plugins/observability_onboarding/public/components/app/home/index.tsx
index 6dcb343b222cb..13aec2ff31c06 100644
--- a/x-pack/plugins/observability_onboarding/public/components/app/home/index.tsx
+++ b/x-pack/plugins/observability_onboarding/public/components/app/home/index.tsx
@@ -334,6 +334,7 @@ export function Home() {
                     </StyledItem>
                     <StyledItem>
                       <EuiLink
+                        data-test-subj="observabilityOnboardingHomeAwsFirehoseLink"
                         href="https://www.elastic.co/guide/en/kinesis/current/aws-firehose-setup-guide.html"
                         target="_blank"
                         external
diff --git a/x-pack/plugins/observability_onboarding/public/components/app/system_logs/install_elastic_agent.tsx b/x-pack/plugins/observability_onboarding/public/components/app/system_logs/install_elastic_agent.tsx
index 4c7e7fd63625e..4a753161d39b0 100644
--- a/x-pack/plugins/observability_onboarding/public/components/app/system_logs/install_elastic_agent.tsx
+++ b/x-pack/plugins/observability_onboarding/public/components/app/system_logs/install_elastic_agent.tsx
@@ -194,7 +194,11 @@ export function InstallElasticAgent() {
       panelFooter={
         <StepPanelFooter
           items={[
-            <EuiButton color="text" onClick={onBack}>
+            <EuiButton
+              data-test-subj="observabilityOnboardingInstallElasticAgentBackButton"
+              color="text"
+              onClick={onBack}
+            >
               {i18n.translate(
                 'xpack.observability_onboarding.systemLogs.back',
                 { defaultMessage: 'Back' }
diff --git a/x-pack/plugins/observability_onboarding/public/components/shared/install_elastic_agent_steps.tsx b/x-pack/plugins/observability_onboarding/public/components/shared/install_elastic_agent_steps.tsx
index 282591e0a1487..2d5a42f7c287e 100644
--- a/x-pack/plugins/observability_onboarding/public/components/shared/install_elastic_agent_steps.tsx
+++ b/x-pack/plugins/observability_onboarding/public/components/shared/install_elastic_agent_steps.tsx
@@ -221,6 +221,7 @@ export function InstallElasticAgentSteps<PlatformId extends string>({
                     values={{
                       hostRequirementsLink: (
                         <EuiLink
+                          data-test-subj="observabilityOnboardingInstallElasticAgentStepsHostRequirementsAndOtherInstallationOptionsLink"
                           external
                           href="https://www.elastic.co/guide/en/fleet/8.7/elastic-agent-installation.html"
                         >
diff --git a/x-pack/plugins/observability_onboarding/public/components/shared/troubleshooting_link.tsx b/x-pack/plugins/observability_onboarding/public/components/shared/troubleshooting_link.tsx
index 5b6a1588d643c..71ab94a9bade8 100644
--- a/x-pack/plugins/observability_onboarding/public/components/shared/troubleshooting_link.tsx
+++ b/x-pack/plugins/observability_onboarding/public/components/shared/troubleshooting_link.tsx
@@ -13,6 +13,7 @@ export function TroubleshootingLink() {
   return (
     <EuiFlexGroup alignItems="center" justifyContent="center">
       <EuiButtonEmpty
+        data-test-subj="observabilityOnboardingTroubleshootingLinkTroubleshootingButton"
         iconType="help"
         color="primary"
         href="https://www.elastic.co/guide/en/observability/current/logs-troubleshooting.html"
diff --git a/x-pack/plugins/profiling/public/components/check_setup.tsx b/x-pack/plugins/profiling/public/components/check_setup.tsx
index cec2cc6f81c96..3bfb920f25eb1 100644
--- a/x-pack/plugins/profiling/public/components/check_setup.tsx
+++ b/x-pack/plugins/profiling/public/components/check_setup.tsx
@@ -130,6 +130,7 @@ export function CheckSetup({ children }: { children: React.ReactElement }) {
                           values={{
                             dataRetentionLink: (
                               <EuiLink
+                                data-test-subj="profilingCheckSetupControllingDataRetentionLink"
                                 href={`${docLinks.ELASTIC_WEBSITE_URL}/guide/en/elasticsearch/reference/${docLinks.DOC_LINK_VERSION}/set-up-lifecycle-policy.html`}
                                 target="_blank"
                               >
@@ -152,6 +153,7 @@ export function CheckSetup({ children }: { children: React.ReactElement }) {
               },
               button: (
                 <EuiButton
+                  data-test-subj="profilingCheckSetupButton"
                   disabled={postSetupLoading}
                   onClick={(event) => {
                     event.preventDefault();
diff --git a/x-pack/plugins/profiling/public/components/flamegraph/flamegraph_tooltip.tsx b/x-pack/plugins/profiling/public/components/flamegraph/flamegraph_tooltip.tsx
index ae37ebf65c9f0..7a3b661cdac6d 100644
--- a/x-pack/plugins/profiling/public/components/flamegraph/flamegraph_tooltip.tsx
+++ b/x-pack/plugins/profiling/public/components/flamegraph/flamegraph_tooltip.tsx
@@ -160,7 +160,12 @@ export function FlameGraphTooltip({
                 style={{ background: theme.euiTheme.border.color }}
               />
               <EuiFlexItem>
-                <EuiButtonEmpty size="s" iconType="inspect" onClick={onShowMoreClick}>
+                <EuiButtonEmpty
+                  data-test-subj="profilingFlameGraphTooltipButton"
+                  size="s"
+                  iconType="inspect"
+                  onClick={onShowMoreClick}
+                >
                   <EuiText size="xs">
                     {i18n.translate('xpack.profiling.flameGraphTooltip.showMoreButton', {
                       defaultMessage: `Show more information`,
diff --git a/x-pack/plugins/profiling/public/components/frame_information_window/missing_symbols_callout.tsx b/x-pack/plugins/profiling/public/components/frame_information_window/missing_symbols_callout.tsx
index 1f9d40d23a648..ac2c2e7a2407b 100644
--- a/x-pack/plugins/profiling/public/components/frame_information_window/missing_symbols_callout.tsx
+++ b/x-pack/plugins/profiling/public/components/frame_information_window/missing_symbols_callout.tsx
@@ -41,6 +41,7 @@ export function MissingSymbolsCallout({ frameType }: Props) {
             values={{
               readMore: (
                 <EuiLink
+                  data-test-subj="profilingMissingSymbolsCalloutReadMoreLink"
                   href={`${docLinks.ELASTIC_WEBSITE_URL}/guide/en/observability/${docLinks.DOC_LINK_VERSION}/profiling-add-symbols.html`}
                   target="_blank"
                 >
@@ -54,6 +55,7 @@ export function MissingSymbolsCallout({ frameType }: Props) {
           />
         </p>
         <EuiButton
+          data-test-subj="profilingMissingSymbolsCalloutUploadSymbolsButton"
           href={router.link('/add-data-instructions', {
             query: { selectedTab: AddDataTabs.Symbols },
           })}
@@ -83,7 +85,12 @@ export function MissingSymbolsCallout({ frameType }: Props) {
             'Symbols are not available because of an error in the unwinder for this language or an unknown error with the interpreter.',
         })}
       </p>
-      <EuiButton href={PROFILING_FEEDBACK_LINK} target="_blank" color="warning">
+      <EuiButton
+        data-test-subj="profilingMissingSymbolsCalloutReportAProblemButton"
+        href={PROFILING_FEEDBACK_LINK}
+        target="_blank"
+        color="warning"
+      >
         {i18n.translate(
           'xpack.profiling.frameInformationWindow.missingSymbols.interpreted.reportProblem',
           { defaultMessage: 'Report a problem' }
diff --git a/x-pack/plugins/profiling/public/components/license_prompt/index.tsx b/x-pack/plugins/profiling/public/components/license_prompt/index.tsx
index 5ec11800d176e..43af8257efea3 100644
--- a/x-pack/plugins/profiling/public/components/license_prompt/index.tsx
+++ b/x-pack/plugins/profiling/public/components/license_prompt/index.tsx
@@ -38,7 +38,11 @@ export function LicensePrompt() {
         </p>
       }
       actions={[
-        <EuiButton href={manageLicenseURL} fill>
+        <EuiButton
+          data-test-subj="profilingLicensePromptUpgradeSubscriptionButton"
+          href={manageLicenseURL}
+          fill
+        >
           {i18n.translate('xpack.profiling.invalidLicense.subscriptionManagementLink', {
             defaultMessage: 'Upgrade subscription',
           })}
diff --git a/x-pack/plugins/profiling/public/components/normalization_menu/index.tsx b/x-pack/plugins/profiling/public/components/normalization_menu/index.tsx
index 3d80d43bbe89c..da17c339814e4 100644
--- a/x-pack/plugins/profiling/public/components/normalization_menu/index.tsx
+++ b/x-pack/plugins/profiling/public/components/normalization_menu/index.tsx
@@ -95,6 +95,7 @@ export function NormalizationMenu(props: Props) {
           prepend={NORMALIZE_BY_LABEL}
           append={
             <EuiButtonIcon
+              data-test-subj="profilingNormalizationMenuButton"
               iconType="arrowDown"
               aria-label={i18n.translate(
                 'xpack.profiling.normalizationMenu.menuPopoverButtonAriaLabel',
@@ -191,6 +192,7 @@ export function NormalizationMenu(props: Props) {
         prepend={<EuiFormLabel htmlFor={baselineScaleFactorInputId}>{SCALE_LABEL}</EuiFormLabel>}
       >
         <EuiFieldNumber
+          data-test-subj="profilingNormalizationMenuFieldNumber"
           controlOnly
           id={baselineScaleFactorInputId}
           value={baseline}
@@ -219,6 +221,7 @@ export function NormalizationMenu(props: Props) {
         prepend={<EuiFormLabel htmlFor={comparisonScaleFactorInputId}>{SCALE_LABEL}</EuiFormLabel>}
       >
         <EuiFieldNumber
+          data-test-subj="profilingNormalizationMenuFieldNumber"
           controlOnly
           id={comparisonScaleFactorInputId}
           value={comparison}
@@ -235,6 +238,7 @@ export function NormalizationMenu(props: Props) {
       </EuiFormControlLayout>
       <EuiSpacer size="m" />
       <EuiButton
+        data-test-subj="profilingNormalizationMenuApplyChangesButton"
         onClick={() => {
           props.onChange(mode, options);
           setIsPopoverOpen(false);
diff --git a/x-pack/plugins/profiling/public/components/primary_and_comparison_search_bar.tsx b/x-pack/plugins/profiling/public/components/primary_and_comparison_search_bar.tsx
index 12375925bb606..e5a60a7d95149 100644
--- a/x-pack/plugins/profiling/public/components/primary_and_comparison_search_bar.tsx
+++ b/x-pack/plugins/profiling/public/components/primary_and_comparison_search_bar.tsx
@@ -91,6 +91,7 @@ export function PrimaryAndComparisonSearchBar() {
       <EuiFlexItem grow={false} style={{ padding: '0 8px' }}>
         <EuiToolTip position="top" content="Swap sides">
           <EuiButtonIcon
+            data-test-subj="profilingPrimaryAndComparisonSearchBarButton"
             iconType="merge"
             size="m"
             onClick={() => {
diff --git a/x-pack/plugins/profiling/public/components/profiling_app_page_template/index.tsx b/x-pack/plugins/profiling/public/components/profiling_app_page_template/index.tsx
index a62d342b3919e..e094038e2f190 100644
--- a/x-pack/plugins/profiling/public/components/profiling_app_page_template/index.tsx
+++ b/x-pack/plugins/profiling/public/components/profiling_app_page_template/index.tsx
@@ -70,6 +70,7 @@ export function ProfilingAppPageTemplate({
         'data-test-subj': 'profilingPageTemplate',
         rightSideItems: [
           <EuiButton
+            data-test-subj="profilingProfilingAppPageTemplateGiveFeedbackButton"
             href={PROFILING_FEEDBACK_LINK}
             target="_blank"
             color="warning"
@@ -134,6 +135,7 @@ export function ProfilingAppPageTemplate({
                 })}
               </p>
               <EuiButton
+                data-test-subj="profilingProfilingAppPageTemplateDismissButton"
                 onClick={() => {
                   setPrivilegesWarningDismissed(true);
                 }}
diff --git a/x-pack/plugins/profiling/public/components/stack_frame_summary/index.tsx b/x-pack/plugins/profiling/public/components/stack_frame_summary/index.tsx
index 5533df8479d4e..d73c382962a59 100644
--- a/x-pack/plugins/profiling/public/components/stack_frame_summary/index.tsx
+++ b/x-pack/plugins/profiling/public/components/stack_frame_summary/index.tsx
@@ -39,7 +39,7 @@ export function StackFrameSummary({ frame, onFrameClick }: Props) {
       <EuiFlexItem>
         <div>
           {onFrameClick ? (
-            <EuiLink onClick={handleOnClick}>
+            <EuiLink data-test-subj="profilingStackFrameSummaryLink" onClick={handleOnClick}>
               <CalleeFunctionText calleeFunctionName={calleeFunctionName} />
             </EuiLink>
           ) : (
diff --git a/x-pack/plugins/profiling/public/components/subchart.tsx b/x-pack/plugins/profiling/public/components/subchart.tsx
index ee388b851d0ed..4100425cb05d6 100644
--- a/x-pack/plugins/profiling/public/components/subchart.tsx
+++ b/x-pack/plugins/profiling/public/components/subchart.tsx
@@ -135,7 +135,7 @@ export function SubChart({
           </EuiFlexGroup>
 
           {hasMoreFrames && !!onShowMoreClick && (
-            <EuiButton onClick={onShowMoreClick}>
+            <EuiButton data-test-subj="profilingSubChartShowMoreButton" onClick={onShowMoreClick}>
               {i18n.translate('xpack.profiling.stackTracesView.showMoreTracesButton', {
                 defaultMessage: 'Show more',
               })}
@@ -185,13 +185,13 @@ export function SubChart({
           </EuiFlexItem>
           <EuiFlexItem grow style={{ alignItems: 'flex-start' }}>
             {showFrames ? (
-              <EuiLink onClick={() => onShowMoreClick?.()}>
+              <EuiLink data-test-subj="profilingSubChartLink" onClick={() => onShowMoreClick?.()}>
                 <EuiText size="s">{label}</EuiText>
               </EuiLink>
             ) : category === OTHER_BUCKET_LABEL ? (
               <EuiText size="s">{label}</EuiText>
             ) : (
-              <EuiLink href={href}>
+              <EuiLink data-test-subj="profilingSubChartLink" href={href}>
                 <EuiText size="s">{label}</EuiText>
               </EuiLink>
             )}
diff --git a/x-pack/plugins/profiling/public/components/topn_functions/index.tsx b/x-pack/plugins/profiling/public/components/topn_functions/index.tsx
index ec99236cb135f..4ec9bb8631327 100644
--- a/x-pack/plugins/profiling/public/components/topn_functions/index.tsx
+++ b/x-pack/plugins/profiling/public/components/topn_functions/index.tsx
@@ -227,6 +227,7 @@ export const TopNFunctionsGrid = forwardRef(
             }
             return (
               <EuiButtonIcon
+                data-test-subj="profilingTopNFunctionsGridButton"
                 aria-label="Show actions"
                 iconType="expand"
                 color="text"
diff --git a/x-pack/plugins/profiling/public/views/add_data_view/index.tsx b/x-pack/plugins/profiling/public/views/add_data_view/index.tsx
index 6025e6685c19d..de5713f30c21a 100644
--- a/x-pack/plugins/profiling/public/views/add_data_view/index.tsx
+++ b/x-pack/plugins/profiling/public/views/add_data_view/index.tsx
@@ -345,6 +345,7 @@ EOF`}
           }),
           content: (
             <EuiButton
+              data-test-subj="profilingAddDataViewManageUniversalProfilingAgentInFleetButton"
               iconType="gear"
               fill
               href={`${core.http.basePath.prepend(
@@ -392,6 +393,7 @@ EOF`}
           content: (
             <EuiText>
               <EuiLink
+                data-test-subj="profilingAddDataViewInstructionsHereLink"
                 target="_blank"
                 href={`https://www.elastic.co/guide/en/kibana/master/api-keys.html`}
               >
@@ -430,6 +432,7 @@ EOF`}
                   values={{
                     link: (
                       <EuiLink
+                        data-test-subj="profilingAddDataViewTheCorrespondingDocumentationPageLink"
                         target="_blank"
                         href={`${core.docLinks.ELASTIC_WEBSITE_URL}/guide/en/observability/${core.docLinks.DOC_LINK_VERSION}/profiling-add-symbols.html`}
                       >
@@ -493,6 +496,7 @@ EOF`}
                   versionTo: <strong>6.4</strong>,
                   linuxLink: (
                     <EuiLink
+                      data-test-subj="profilingAddDataViewLinuxKernelBugLink"
                       target="_blank"
                       href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d319f344561de23e810515d109c7278919bff7b0"
                     >
@@ -503,6 +507,7 @@ EOF`}
                   ),
                   debianLink: (
                     <EuiLink
+                      data-test-subj="profilingAddDataViewDebianLink"
                       target="_blank"
                       href="https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1033398"
                     >
@@ -513,6 +518,7 @@ EOF`}
                   ),
                   fedoraLink: (
                     <EuiLink
+                      data-test-subj="profilingAddDataViewFedoraCentOsLink"
                       target="_blank"
                       href="https://bugzilla.redhat.com/show_bug.cgi?id=2211455"
                     >
@@ -523,6 +529,7 @@ EOF`}
                   ),
                   advancedLink: (
                     <EuiLink
+                      data-test-subj="profilingAddDataViewAdvancedConfigurationLink"
                       target="_blank"
                       href={`${core.docLinks.ELASTIC_WEBSITE_URL}/guide/en/observability/${core.docLinks.DOC_LINK_VERSION}/profiling-advanced-configuration.html`}
                     >
diff --git a/x-pack/plugins/profiling/public/views/delete_data_view/index.tsx b/x-pack/plugins/profiling/public/views/delete_data_view/index.tsx
index 7e07ba4a1ec86..c4f1399edafe7 100644
--- a/x-pack/plugins/profiling/public/views/delete_data_view/index.tsx
+++ b/x-pack/plugins/profiling/public/views/delete_data_view/index.tsx
@@ -28,6 +28,7 @@ export function DeleteDataView() {
           footer={
             <div>
               <EuiLink
+                data-test-subj="profilingDeleteDataViewDeleteExistingProfilingDataLink"
                 href={`${docLinks.ELASTIC_WEBSITE_URL}/guide/en/observability/${docLinks.DOC_LINK_VERSION}/profiling-upgrade.html#profiling-delete-data`}
                 target="_blank"
               >
diff --git a/x-pack/plugins/profiling/public/views/stack_traces_view/index.tsx b/x-pack/plugins/profiling/public/views/stack_traces_view/index.tsx
index 0df1f9ae855f9..f024b8a21dcce 100644
--- a/x-pack/plugins/profiling/public/views/stack_traces_view/index.tsx
+++ b/x-pack/plugins/profiling/public/views/stack_traces_view/index.tsx
@@ -170,6 +170,7 @@ export function StackTracesView() {
         {(data?.charts.length ?? 0) > limit && (
           <EuiFlexItem>
             <EuiButton
+              data-test-subj="profilingStackTracesViewShowMoreButton"
               onClick={() => {
                 profilingRouter.push(routePath, {
                   path,
diff --git a/x-pack/plugins/profiling/public/views/storage_explorer/distinct_probabilistic_values_warning.tsx b/x-pack/plugins/profiling/public/views/storage_explorer/distinct_probabilistic_values_warning.tsx
index 1427eed54de41..4c963c79a2e7a 100644
--- a/x-pack/plugins/profiling/public/views/storage_explorer/distinct_probabilistic_values_warning.tsx
+++ b/x-pack/plugins/profiling/public/views/storage_explorer/distinct_probabilistic_values_warning.tsx
@@ -43,6 +43,7 @@ export function DistinctProbabilisticValuesWarning({
       </EuiText>
       <EuiSpacer />
       <EuiButton
+        data-test-subj="profilingDistinctProbabilisticValuesWarningLearnHowButton"
         href={`${docLinks.ELASTIC_WEBSITE_URL}/guide/en/observability/${docLinks.DOC_LINK_VERSION}/profiling-probabilistic-profiling.html`}
         color="warning"
         target="_blank"
diff --git a/x-pack/plugins/profiling/public/views/storage_explorer/summary.tsx b/x-pack/plugins/profiling/public/views/storage_explorer/summary.tsx
index 19a3e95809155..1708c686c980c 100644
--- a/x-pack/plugins/profiling/public/views/storage_explorer/summary.tsx
+++ b/x-pack/plugins/profiling/public/views/storage_explorer/summary.tsx
@@ -121,6 +121,7 @@ export function Summary({ data, isLoading }: Props) {
           <EuiFlexGroup direction="column">
             <EuiFlexItem grow={false}>
               <EuiLink
+                data-test-subj="profilingSummaryGoToUniversalProfilingLink"
                 href={profilingRouter.link('/stacktraces/{topNType}', {
                   path: { topNType: TopNType.Hosts },
                   query: {
@@ -139,6 +140,7 @@ export function Summary({ data, isLoading }: Props) {
             </EuiFlexItem>
             <EuiFlexItem grow={false}>
               <EuiLink
+                data-test-subj="profilingSummaryGoToIndexManagementLink"
                 href={core.http.basePath.prepend(
                   '/app/management/data/index_management/data_streams'
                 )}
diff --git a/x-pack/plugins/synthetics/public/apps/synthetics/components/certificates/fingerprint_col.tsx b/x-pack/plugins/synthetics/public/apps/synthetics/components/certificates/fingerprint_col.tsx
index 138ae4d1073cc..3e6fdd997f162 100644
--- a/x-pack/plugins/synthetics/public/apps/synthetics/components/certificates/fingerprint_col.tsx
+++ b/x-pack/plugins/synthetics/public/apps/synthetics/components/certificates/fingerprint_col.tsx
@@ -31,6 +31,7 @@ export const FingerprintCol: React.FC<Props> = ({ cert }) => {
         <EuiCopy textToCopy={val ?? ''}>
           {(copy) => (
             <EuiButtonIcon
+              data-test-subj="syntheticsShaComponentButton"
               aria-label={COPY_FINGERPRINT}
               onClick={copy}
               iconType="copy"
diff --git a/x-pack/plugins/synthetics/public/apps/synthetics/components/common/links/step_details_link.tsx b/x-pack/plugins/synthetics/public/apps/synthetics/components/common/links/step_details_link.tsx
index e66e852739d32..3414f2b2bfd13 100644
--- a/x-pack/plugins/synthetics/public/apps/synthetics/components/common/links/step_details_link.tsx
+++ b/x-pack/plugins/synthetics/public/apps/synthetics/components/common/links/step_details_link.tsx
@@ -50,6 +50,7 @@ export const StepDetailsLinkIcon = ({
 
   return (
     <EuiButtonIcon
+      data-test-subj="syntheticsStepDetailsLinkIconButton"
       {...commonProps}
       aria-label={VIEW_DETAILS}
       title={VIEW_DETAILS}
diff --git a/x-pack/plugins/synthetics/public/apps/synthetics/components/common/links/view_alerts.tsx b/x-pack/plugins/synthetics/public/apps/synthetics/components/common/links/view_alerts.tsx
index b62c46796b66a..4663ca819dca1 100644
--- a/x-pack/plugins/synthetics/public/apps/synthetics/components/common/links/view_alerts.tsx
+++ b/x-pack/plugins/synthetics/public/apps/synthetics/components/common/links/view_alerts.tsx
@@ -15,7 +15,12 @@ export const AlertsLink = () => {
 
   return (
     <EuiToolTip content={VIEW_ALERTS}>
-      <EuiButtonIcon aria-label={VIEW_ALERTS} href={alertUrl} iconType="inspect" />
+      <EuiButtonIcon
+        data-test-subj="syntheticsAlertsLinkButton"
+        aria-label={VIEW_ALERTS}
+        href={alertUrl}
+        iconType="inspect"
+      />
     </EuiToolTip>
   );
 };
diff --git a/x-pack/plugins/synthetics/public/apps/synthetics/components/common/links/view_errors.tsx b/x-pack/plugins/synthetics/public/apps/synthetics/components/common/links/view_errors.tsx
index 0ca0b19a4f58e..e41b2be1a7c11 100644
--- a/x-pack/plugins/synthetics/public/apps/synthetics/components/common/links/view_errors.tsx
+++ b/x-pack/plugins/synthetics/public/apps/synthetics/components/common/links/view_errors.tsx
@@ -16,6 +16,7 @@ export const ErrorsLink = ({ disabled }: { disabled?: boolean }) => {
   return (
     <EuiToolTip content={VIEW_ERRORS}>
       <EuiButtonIcon
+        data-test-subj="syntheticsErrorsLinkButton"
         aria-label={VIEW_ERRORS}
         href={`${basePath}/app/synthetics/errors`}
         iconType="inspect"
diff --git a/x-pack/plugins/synthetics/public/apps/synthetics/components/common/monitor_test_result/browser_steps_list.tsx b/x-pack/plugins/synthetics/public/apps/synthetics/components/common/monitor_test_result/browser_steps_list.tsx
index 647109b68ce38..f596b632fe158 100644
--- a/x-pack/plugins/synthetics/public/apps/synthetics/components/common/monitor_test_result/browser_steps_list.tsx
+++ b/x-pack/plugins/synthetics/public/apps/synthetics/components/common/monitor_test_result/browser_steps_list.tsx
@@ -148,6 +148,7 @@ export const BrowserStepsList = ({
             isExpander: true,
             render: (item: JourneyStep) => (
               <EuiButtonIcon
+                data-test-subj="syntheticsColumnsButton"
                 onClick={() => toggleDetails(item)}
                 aria-label={expandedMap[item._id] ? 'Collapse' : 'Expand'}
                 iconType={expandedMap[item._id] ? 'arrowDown' : 'arrowRight'}
diff --git a/x-pack/plugins/synthetics/public/apps/synthetics/components/monitor_add_edit/fields/key_value_field.tsx b/x-pack/plugins/synthetics/public/apps/synthetics/components/monitor_add_edit/fields/key_value_field.tsx
index 7d062fbde7548..58470a204ab51 100644
--- a/x-pack/plugins/synthetics/public/apps/synthetics/components/monitor_add_edit/fields/key_value_field.tsx
+++ b/x-pack/plugins/synthetics/public/apps/synthetics/components/monitor_add_edit/fields/key_value_field.tsx
@@ -156,6 +156,7 @@ export const KeyValuePairsField = ({
                 append={
                   <EuiFormLabel>
                     <EuiButtonIcon
+                      data-test-subj="syntheticsKeyValuePairsFieldButton"
                       iconType="trash"
                       aria-label={i18n.translate(
                         'xpack.synthetics.keyValuePairsField.deleteItem.label',
diff --git a/x-pack/plugins/synthetics/public/apps/synthetics/components/monitor_details/monitor_selector/monitor_selector.tsx b/x-pack/plugins/synthetics/public/apps/synthetics/components/monitor_details/monitor_selector/monitor_selector.tsx
index c19c93125f885..e4c7dec97f299 100644
--- a/x-pack/plugins/synthetics/public/apps/synthetics/components/monitor_details/monitor_selector/monitor_selector.tsx
+++ b/x-pack/plugins/synthetics/public/apps/synthetics/components/monitor_details/monitor_selector/monitor_selector.tsx
@@ -23,6 +23,7 @@ export const MonitorSelector = () => {
 
   const button = (
     <EuiButtonIcon
+      data-test-subj="syntheticsMonitorSelectorButton"
       size="s"
       iconType="arrowDown"
       onClick={onButtonClick}
diff --git a/x-pack/plugins/synthetics/public/apps/synthetics/components/monitors_page/management/monitor_list_table/columns.tsx b/x-pack/plugins/synthetics/public/apps/synthetics/components/monitors_page/management/monitor_list_table/columns.tsx
index 8c3d1a1fe1fd9..0c415ce3d4fb8 100644
--- a/x-pack/plugins/synthetics/public/apps/synthetics/components/monitors_page/management/monitor_list_table/columns.tsx
+++ b/x-pack/plugins/synthetics/public/apps/synthetics/components/monitors_page/management/monitor_list_table/columns.tsx
@@ -240,6 +240,7 @@ export function useMonitorListColumns({
       render: () => (
         <NoPermissionsTooltip canEditSynthetics={canEditSynthetics}>
           <EuiButtonIcon
+            data-test-subj="syntheticsUseMonitorListColumnsButton"
             iconType="boxesHorizontal"
             isDisabled={true}
             aria-label={CANNOT_PERFORM_ACTION_SYNTHETICS}
diff --git a/x-pack/plugins/synthetics/public/apps/synthetics/components/monitors_page/overview/overview/actions_popover.tsx b/x-pack/plugins/synthetics/public/apps/synthetics/components/monitors_page/overview/overview/actions_popover.tsx
index 2a6f71aeca9f2..ad3c29a0f77bf 100644
--- a/x-pack/plugins/synthetics/public/apps/synthetics/components/monitors_page/overview/overview/actions_popover.tsx
+++ b/x-pack/plugins/synthetics/public/apps/synthetics/components/monitors_page/overview/overview/actions_popover.tsx
@@ -244,6 +244,7 @@ export function ActionsPopover({
         button={
           <IconPanel hasPanel={iconHasPanel}>
             <EuiButtonIcon
+              data-test-subj="syntheticsActionsPopoverButton"
               aria-label={openActionsMenuAria}
               iconType="boxesHorizontal"
               color="primary"
diff --git a/x-pack/plugins/synthetics/public/apps/synthetics/components/monitors_page/overview/overview/grid_by_group/grid_group_item.tsx b/x-pack/plugins/synthetics/public/apps/synthetics/components/monitors_page/overview/overview/grid_by_group/grid_group_item.tsx
index a7da9e62e54a2..8f92887da6ba8 100644
--- a/x-pack/plugins/synthetics/public/apps/synthetics/components/monitors_page/overview/overview/grid_by_group/grid_group_item.tsx
+++ b/x-pack/plugins/synthetics/public/apps/synthetics/components/monitors_page/overview/overview/grid_by_group/grid_group_item.tsx
@@ -99,6 +99,7 @@ export const GroupGridItem = ({
         <EuiFlexGroup alignItems="center" gutterSize="s">
           <EuiFlexItem>
             <EuiButtonIcon
+              data-test-subj="syntheticsGroupGridItemButton"
               isDisabled={groupMonitors.length === 0}
               className="fullScreenButton"
               iconType="fullScreen"
diff --git a/x-pack/plugins/synthetics/public/apps/synthetics/components/monitors_page/overview/overview/metric_item_icon.tsx b/x-pack/plugins/synthetics/public/apps/synthetics/components/monitors_page/overview/overview/metric_item_icon.tsx
index 0ea3441603e26..7dacc511c2e70 100644
--- a/x-pack/plugins/synthetics/public/apps/synthetics/components/monitors_page/overview/overview/metric_item_icon.tsx
+++ b/x-pack/plugins/synthetics/public/apps/synthetics/components/monitors_page/overview/overview/metric_item_icon.tsx
@@ -120,6 +120,7 @@ export const MetricItemIcon = ({
               }}
             >
               <EuiButtonIcon
+                data-test-subj="syntheticsMetricItemIconButton"
                 iconType="warning"
                 color="danger"
                 size="m"
@@ -138,7 +139,11 @@ export const MetricItemIcon = ({
             <EuiFlexGroup>
               <EuiFlexItem grow>{testTime}</EuiFlexItem>
               <EuiFlexItem grow={false}>
-                <EuiButtonIcon iconType="cross" onClick={closePopover} />
+                <EuiButtonIcon
+                  data-test-subj="syntheticsMetricItemIconButton"
+                  iconType="cross"
+                  onClick={closePopover}
+                />
               </EuiFlexItem>
             </EuiFlexGroup>
           </EuiPopoverTitle>
diff --git a/x-pack/plugins/synthetics/public/apps/synthetics/components/settings/global_params/params_text.tsx b/x-pack/plugins/synthetics/public/apps/synthetics/components/settings/global_params/params_text.tsx
index 71024bf9899a7..42bb72f541648 100644
--- a/x-pack/plugins/synthetics/public/apps/synthetics/components/settings/global_params/params_text.tsx
+++ b/x-pack/plugins/synthetics/public/apps/synthetics/components/settings/global_params/params_text.tsx
@@ -16,6 +16,7 @@ export const ParamsText = ({ text }: { text: string }) => {
     <EuiFlexGroup gutterSize="s" justifyContent="flexStart">
       <EuiFlexItem grow={false}>
         <EuiButtonIcon
+          data-test-subj="syntheticsParamsTextButton"
           iconType={!isViewing ? 'eye' : 'eyeClosed'}
           aria-label={i18n.translate('xpack.synthetics.settingsRoute.viewParam', {
             defaultMessage: 'View parameter value',
diff --git a/x-pack/plugins/synthetics/public/apps/synthetics/components/step_details_page/step_waterfall_chart/waterfall/waterfall_marker/waterfall_marker_icon.tsx b/x-pack/plugins/synthetics/public/apps/synthetics/components/step_details_page/step_waterfall_chart/waterfall/waterfall_marker/waterfall_marker_icon.tsx
index 99a677e50d79a..bdb2b447a404f 100644
--- a/x-pack/plugins/synthetics/public/apps/synthetics/components/step_details_page/step_waterfall_chart/waterfall/waterfall_marker/waterfall_marker_icon.tsx
+++ b/x-pack/plugins/synthetics/public/apps/synthetics/components/step_details_page/step_waterfall_chart/waterfall/waterfall_marker/waterfall_marker_icon.tsx
@@ -36,6 +36,7 @@ export function WaterfallMarkerIcon({ field, label }: { field: string; label: st
       css={{ top: 4 }}
       button={
         <EuiButtonIcon
+          data-test-subj="syntheticsWaterfallMarkerIconButton"
           css={{ color: euiTheme.colors.mediumShade }}
           aria-label={i18n.translate(
             'xpack.synthetics.synthetics.markers.openEmbeddableButton.label',
diff --git a/x-pack/plugins/ux/public/components/app/rum_dashboard/page_load_distribution/reset_percentile_zoom.tsx b/x-pack/plugins/ux/public/components/app/rum_dashboard/page_load_distribution/reset_percentile_zoom.tsx
index d334bd160a5cc..0b138e663f102 100644
--- a/x-pack/plugins/ux/public/components/app/rum_dashboard/page_load_distribution/reset_percentile_zoom.tsx
+++ b/x-pack/plugins/ux/public/components/app/rum_dashboard/page_load_distribution/reset_percentile_zoom.tsx
@@ -33,6 +33,7 @@ export function ResetPercentileZoom({
     <EuiFlexItem grow={false}>
       <EuiShowFor sizes={['xs']}>
         <EuiButtonIcon
+          data-test-subj="uxResetPercentileZoomButton"
           iconType="inspect"
           size="s"
           aria-label={I18LABELS.resetZoom}