[8.x](backport #5999) Add failureThreshold to elastic-agent self-monitoring config

internal/pkg/agent/application/coordinator/diagnostics_test.go

@@ -100,6 +100,7 @@ agent:
     metrics_period: ""
     namespace: ""
     pprof: null
+    failure_threshold: null
     traces: true
     apm:
       hosts:

internal/pkg/agent/application/monitoring/v1_monitor.go

@@ -11,6 +11,7 @@ import (
 	"os"
 	"path/filepath"
 	"runtime"
+	"strconv"
 	"strings"
 	"time"
 	"unicode"
@@ -48,6 +49,7 @@ const (
 	monitoringKey              = "monitoring"
 	useOutputKey               = "use_output"
 	monitoringMetricsPeriodKey = "metrics_period"
+	failureThresholdKey        = "failure_threshold"
 	monitoringOutput           = "monitoring"
 	defaultMonitoringNamespace = "default"
 	agentName                  = "elastic-agent"
@@ -60,6 +62,10 @@ const (
 	// metricset execution period used for the monitoring metrics inputs
 	// we set this to 60s to reduce the load/data volume on the monitoring cluster
 	defaultMetricsCollectionInterval = 60 * time.Second
+
+	// metricset stream failure threshold before the stream is marked as DEGRADED
+	// to avoid marking the agent degraded for transient errors, we set the default threshold to 2
+	defaultMetricsStreamFailureThreshold = uint(2)
 )
 
 var (
@@ -131,6 +137,7 @@ func (b *BeatsMonitor) MonitoringConfig(
 
 	monitoringOutputName := defaultOutputName
 	metricsCollectionIntervalString := b.config.C.MetricsPeriod
+	failureThreshold := b.config.C.FailureThreshold
 	if agentCfg, found := policy[agentKey]; found {
 		// The agent section is required for feature flags
 		cfg[agentKey] = agentCfg
@@ -151,6 +158,25 @@ func (b *BeatsMonitor) MonitoringConfig(
 							metricsCollectionIntervalString = metricsPeriodStr
 						}
 					}
+
+					if policyFailureThresholdRaw, found := monitoringMap[failureThresholdKey]; found {
+						switch policyValue := policyFailureThresholdRaw.(type) {
+						case uint:
+							failureThreshold = &policyValue
+						case int:
+							unsignedValue := uint(policyValue)
+							failureThreshold = &unsignedValue
+						case string:
+							parsedPolicyValue, err := strconv.Atoi(policyValue)
+							if err != nil {
+								return nil, fmt.Errorf("failed to convert policy failure threshold string to int: %w", err)
+							}
+							uintPolicyValue := uint(parsedPolicyValue)
+							failureThreshold = &uintPolicyValue
+						default:
+							return nil, fmt.Errorf("unsupported type for policy failure threshold: %T", policyFailureThresholdRaw)
+						}
+					}
 				}
 			}
 		}
@@ -173,7 +199,7 @@ func (b *BeatsMonitor) MonitoringConfig(
 	}
 
 	if b.config.C.MonitorMetrics {
-		if err := b.injectMetricsInput(cfg, componentIDToBinary, components, componentIDPidMap, metricsCollectionIntervalString); err != nil {
+		if err := b.injectMetricsInput(cfg, componentIDToBinary, components, componentIDPidMap, metricsCollectionIntervalString, failureThreshold); err != nil {
 			return nil, errors.New(err, "failed to inject monitoring output")
 		}
 	}
@@ -556,12 +582,20 @@ func (b *BeatsMonitor) injectMetricsInput(
 	componentList []component.Component,
 	existingStateServicePids map[string]uint64,
 	metricsCollectionIntervalString string,
+	failureThreshold *uint,
 ) error {
 	if metricsCollectionIntervalString == "" {
 		metricsCollectionIntervalString = defaultMetricsCollectionInterval.String()
 	}
+
+	if failureThreshold == nil {
+		defaultValue := defaultMetricsStreamFailureThreshold
+		failureThreshold = &defaultValue
+	}
 	monitoringNamespace := b.monitoringNamespace()
 	fixedAgentName := strings.ReplaceAll(agentName, "-", "_")
+	// beatStreams and streams MUST be []interface{} even if in reality they are []map[string]interface{}:
+	// if those are declared as slices of maps the message "proto: invalid type: []map[string]interface{}" will pop up
 	beatsStreams := make([]interface{}, 0, len(componentIDToBinary))
 	streams := []interface{}{
 		map[string]interface{}{
@@ -866,6 +900,25 @@ func (b *BeatsMonitor) injectMetricsInput(
 
 	}
 
+	if failureThreshold != nil {
+		// add failure threshold to all streams and beatStreams
+		for _, s := range streams {
+			if streamMap, ok := s.(map[string]interface{}); ok {
+				streamMap[failureThresholdKey] = *failureThreshold
+			} else {
+				return fmt.Errorf("unable to set %s: %d in monitoring stream %q: unexpected type %T", failureThresholdKey, *failureThreshold, s, s)
+			}
+
+		}
+		for _, s := range beatsStreams {
+			if streamMap, ok := s.(map[string]interface{}); ok {
+				streamMap[failureThresholdKey] = *failureThreshold
+			} else {
+				return fmt.Errorf("unable to set %s: %d in monitoring stream %q: unexpected type %T", failureThresholdKey, *failureThreshold, s, s)
+			}
+		}
+	}
+
 	inputs := []interface{}{
 		map[string]interface{}{
 			idKey:        fmt.Sprintf("%s-beats", monitoringMetricsUnitID),

internal/pkg/agent/application/monitoring/v1_monitor_test.go

@@ -235,7 +235,7 @@ func TestMonitoringConfigMetricsInterval(t *testing.T) {
 					// check the streams created for the input, should be a list of objects
 					if assert.Contains(t, input, "streams", "input %q does not contain any stream", inputID) &&
 						assert.IsTypef(t, []any{}, input["streams"], "streams for input %q are not a list of objects", inputID) {
-						// loop over streams and cast to map[string]any to access keys
+						// loop over streams and access keys
 						for _, rawStream := range input["streams"].([]any) {
 							if assert.IsTypef(t, map[string]any{}, rawStream, "stream %v for input %q is not a map", rawStream, inputID) {
 								stream := rawStream.(map[string]any)
@@ -258,6 +258,210 @@ func TestMonitoringConfigMetricsInterval(t *testing.T) {
 	}
 }
 
+func TestMonitoringConfigMetricsFailureThreshold(t *testing.T) {
+
+	agentInfo, err := info.NewAgentInfo(context.Background(), false)
+	require.NoError(t, err, "Error creating agent info")
+
+	sampleFiveErrorsStreamThreshold := uint(5)
+	sampleTenErrorsStreamThreshold := uint(10)
+
+	tcs := []struct {
+		name              string
+		monitoringCfg     *monitoringConfig
+		policy            map[string]any
+		expectedThreshold uint
+	}{
+		{
+			name: "default failure threshold",
+			monitoringCfg: &monitoringConfig{
+				C: &monitoringcfg.MonitoringConfig{
+					Enabled:        true,
+					MonitorMetrics: true,
+					HTTP: &monitoringcfg.MonitoringHTTPConfig{
+						Enabled: false,
+					},
+				},
+			},
+			policy: map[string]any{
+				"agent": map[string]any{
+					"monitoring": map[string]any{
+						"metrics": true,
+						"http": map[string]any{
+							"enabled": false,
+						},
+					},
+				},
+				"outputs": map[string]any{
+					"default": map[string]any{},
+				},
+			},
+			expectedThreshold: defaultMetricsStreamFailureThreshold,
+		},
+		{
+			name: "agent config failure threshold",
+			monitoringCfg: &monitoringConfig{
+				C: &monitoringcfg.MonitoringConfig{
+					Enabled:        true,
+					MonitorMetrics: true,
+					HTTP: &monitoringcfg.MonitoringHTTPConfig{
+						Enabled: false,
+					},
+					FailureThreshold: &sampleFiveErrorsStreamThreshold,
+				},
+			},
+			policy: map[string]any{
+				"agent": map[string]any{
+					"monitoring": map[string]any{
+						"metrics": true,
+						"http": map[string]any{
+							"enabled": false,
+						},
+					},
+				},
+				"outputs": map[string]any{
+					"default": map[string]any{},
+				},
+			},
+			expectedThreshold: sampleFiveErrorsStreamThreshold,
+		},
+		{
+			name: "policy failure threshold uint",
+			monitoringCfg: &monitoringConfig{
+				C: &monitoringcfg.MonitoringConfig{
+					Enabled:        true,
+					MonitorMetrics: true,
+					HTTP: &monitoringcfg.MonitoringHTTPConfig{
+						Enabled: false,
+					},
+					FailureThreshold: &sampleFiveErrorsStreamThreshold,
+				},
+			},
+			policy: map[string]any{
+				"agent": map[string]any{
+					"monitoring": map[string]any{
+						"metrics": true,
+						"http": map[string]any{
+							"enabled": false,
+						},
+						failureThresholdKey: sampleTenErrorsStreamThreshold,
+					},
+				},
+				"outputs": map[string]any{
+					"default": map[string]any{},
+				},
+			},
+			expectedThreshold: sampleTenErrorsStreamThreshold,
+		},
+		{
+			name: "policy failure threshold int",
+			monitoringCfg: &monitoringConfig{
+				C: &monitoringcfg.MonitoringConfig{
+					Enabled:        true,
+					MonitorMetrics: true,
+					HTTP: &monitoringcfg.MonitoringHTTPConfig{
+						Enabled: false,
+					},
+					FailureThreshold: &sampleFiveErrorsStreamThreshold,
+				},
+			},
+			policy: map[string]any{
+				"agent": map[string]any{
+					"monitoring": map[string]any{
+						"metrics": true,
+						"http": map[string]any{
+							"enabled": false,
+						},
+						failureThresholdKey: 10,
+					},
+				},
+				"outputs": map[string]any{
+					"default": map[string]any{},
+				},
+			},
+			expectedThreshold: sampleTenErrorsStreamThreshold,
+		},
+		{
+			name: "policy failure threshold string",
+			monitoringCfg: &monitoringConfig{
+				C: &monitoringcfg.MonitoringConfig{
+					Enabled:        true,
+					MonitorMetrics: true,
+					HTTP: &monitoringcfg.MonitoringHTTPConfig{
+						Enabled: false,
+					},
+					FailureThreshold: &sampleFiveErrorsStreamThreshold,
+				},
+			},
+			policy: map[string]any{
+				"agent": map[string]any{
+					"monitoring": map[string]any{
+						"metrics": true,
+						"http": map[string]any{
+							"enabled": false,
+						},
+						failureThresholdKey: "10",
+					},
+				},
+				"outputs": map[string]any{
+					"default": map[string]any{},
+				},
+			},
+			expectedThreshold: sampleTenErrorsStreamThreshold,
+		},
+	}
+
+	for _, tc := range tcs {
+
+		t.Run(tc.name, func(t *testing.T) {
+			b := &BeatsMonitor{
+				enabled:         true,
+				config:          tc.monitoringCfg,
+				operatingSystem: runtime.GOOS,
+				agentInfo:       agentInfo,
+			}
+			got, err := b.MonitoringConfig(tc.policy, nil, map[string]string{"foobeat": "filebeat"}, map[string]uint64{}) // put a componentID/binary mapping to have something in the beats monitoring input
+			assert.NoError(t, err)
+
+			rawInputs, ok := got["inputs"]
+			require.True(t, ok, "monitoring config contains no input")
+			inputs, ok := rawInputs.([]any)
+			require.True(t, ok, "monitoring inputs are not a list")
+			marshaledInputs, err := yaml.Marshal(inputs)
+			if assert.NoError(t, err, "error marshaling monitoring inputs") {
+				t.Logf("marshaled monitoring inputs:\n%s\n", marshaledInputs)
+			}
+
+			// loop over the created inputs
+			for _, i := range inputs {
+				input, ok := i.(map[string]any)
+				if assert.Truef(t, ok, "input is not represented as a map: %v", i) {
+					inputID := input["id"]
+					t.Logf("input %q", inputID)
+					// check the streams created for the input, should be a list of objects
+					if assert.Contains(t, input, "streams", "input %q does not contain any stream", inputID) &&
+						assert.IsTypef(t, []any{}, input["streams"], "streams for input %q are not a list of objects", inputID) {
+
+						// loop over streams and cast to map[string]any to access keys
+						for _, rawStream := range input["streams"].([]any) {
+							if assert.IsTypef(t, map[string]any{}, rawStream, "stream %v for input %q is not a map", rawStream, inputID) {
+								stream := rawStream.(map[string]any)
+								// check period and assert its value
+								streamID := stream["id"]
+								if assert.Containsf(t, stream, failureThresholdKey, "stream %q for input %q does not contain a failureThreshold", streamID, inputID) &&
+									assert.IsType(t, uint(0), stream[failureThresholdKey], "period for stream %q of input %q is not represented as a string", streamID, inputID) {
+									actualFailureThreshold := stream[failureThresholdKey].(uint)
+									assert.Equalf(t, actualFailureThreshold, tc.expectedThreshold, "unexpected failure threshold for stream %q of input %q", streamID, inputID)
+								}
+							}
+						}
+					}
+				}
+			}
+		})
+	}
+}
+
 func TestMonitoringConfigComponentFields(t *testing.T) {
 	agentInfo, err := info.NewAgentInfo(context.Background(), false)
 	require.NoError(t, err, "Error creating agent info")

internal/pkg/core/monitoring/config/config.go

@@ -21,17 +21,18 @@ const (
 
 // MonitoringConfig describes a configuration of a monitoring
 type MonitoringConfig struct {
-	Enabled        bool                  `yaml:"enabled" config:"enabled"`
-	MonitorLogs    bool                  `yaml:"logs" config:"logs"`
-	MonitorMetrics bool                  `yaml:"metrics" config:"metrics"`
-	MetricsPeriod  string                `yaml:"metrics_period" config:"metrics_period"`
-	LogMetrics     bool                  `yaml:"-" config:"-"`
-	HTTP           *MonitoringHTTPConfig `yaml:"http" config:"http"`
-	Namespace      string                `yaml:"namespace" config:"namespace"`
-	Pprof          *PprofConfig          `yaml:"pprof" config:"pprof"`
-	MonitorTraces  bool                  `yaml:"traces" config:"traces"`
-	APM            APMConfig             `yaml:"apm,omitempty" config:"apm,omitempty" json:"apm,omitempty"`
-	Diagnostics    Diagnostics           `yaml:"diagnostics,omitempty" json:"diagnostics,omitempty"`
+	Enabled          bool                  `yaml:"enabled" config:"enabled"`
+	MonitorLogs      bool                  `yaml:"logs" config:"logs"`
+	MonitorMetrics   bool                  `yaml:"metrics" config:"metrics"`
+	MetricsPeriod    string                `yaml:"metrics_period" config:"metrics_period"`
+	FailureThreshold *uint                 `yaml:"failure_threshold" config:"failure_threshold"`
+	LogMetrics       bool                  `yaml:"-" config:"-"`
+	HTTP             *MonitoringHTTPConfig `yaml:"http" config:"http"`
+	Namespace        string                `yaml:"namespace" config:"namespace"`
+	Pprof            *PprofConfig          `yaml:"pprof" config:"pprof"`
+	MonitorTraces    bool                  `yaml:"traces" config:"traces"`
+	APM              APMConfig             `yaml:"apm,omitempty" config:"apm,omitempty" json:"apm,omitempty"`
+	Diagnostics      Diagnostics           `yaml:"diagnostics,omitempty" json:"diagnostics,omitempty"`
 }
 
 // MonitoringHTTPConfig is a config defining HTTP endpoint published by agent