[cmd/mdatagen] [chore] Small fixes for new resource attributes filter (…

…open-telemetry#9950)

- Make sure we always pass a string to the filter.Match even if the
attribute value has a different type. Otherwise, it panics.
- Make sure we show the if_configured warning if the user sets
include/exclude without enabled.
- Simplify generated tests

Follow up to
open-telemetry#9660

cmd/mdatagen/internal/samplereceiver/internal/metadata/testdata/config.yaml

@@ -58,84 +58,54 @@ none_set:
     string.resource.attr_to_be_removed:
       enabled: false
 filter_set_include:
-  metrics:
-    default.metric:
-      enabled: true
-    default.metric.to_be_removed:
-      enabled: true
-    metric.input_type:
-      enabled: true
-    optional.metric:
-      enabled: true
-    optional.metric.empty_unit:
-      enabled: true
   resource_attributes:
     map.resource.attr:
-      enabled: true
+      include:
+        - regexp: ".*"
     optional.resource.attr:
-      enabled: true
       include:
         - regexp: ".*"
     slice.resource.attr:
-      enabled: true
+      include:
+        - regexp: ".*"
     string.enum.resource.attr:
-      enabled: true
       include:
         - regexp: ".*"
     string.resource.attr:
-      enabled: true
       include:
         - regexp: ".*"
     string.resource.attr_disable_warning:
-      enabled: true
       include:
         - regexp: ".*"
     string.resource.attr_remove_warning:
-      enabled: true
       include:
         - regexp: ".*"
     string.resource.attr_to_be_removed:
-      enabled: true
       include:
         - regexp: ".*"
 filter_set_exclude:
-  metrics:
-    default.metric:
-      enabled: true
-    default.metric.to_be_removed:
-      enabled: true
-    metric.input_type:
-      enabled: true
-    optional.metric:
-      enabled: true
-    optional.metric.empty_unit:
-      enabled: true
   resource_attributes:
     map.resource.attr:
-      enabled: true
+      exclude:
+        - regexp: ".*"
     optional.resource.attr:
-      enabled: true
       exclude:
         - strict: "optional.resource.attr-val"
     slice.resource.attr:
-      enabled: true
+      exclude:
+        - regexp: ".*"
     string.enum.resource.attr:
-      enabled: true
       exclude:
         - strict: "one"
     string.resource.attr:
-      enabled: true
       exclude:
         - strict: "string.resource.attr-val"
     string.resource.attr_disable_warning:
-      enabled: true
       exclude:
         - strict: "string.resource.attr_disable_warning-val"
     string.resource.attr_remove_warning:
-      enabled: true
       exclude:
         - strict: "string.resource.attr_remove_warning-val"
     string.resource.attr_to_be_removed:
-      enabled: true
       exclude:
         - strict: "string.resource.attr_to_be_removed-val"

cmd/mdatagen/templates/config.go.tmpl

@@ -2,12 +2,12 @@
 
 package {{ .Package }}
 
-{{ if or .Metrics .ResourceAttributes -}}
-import "go.opentelemetry.io/collector/confmap"
-{{- end }}
-{{ if .ResourceAttributes -}}
-import "go.opentelemetry.io/collector/filter"
-{{- end }}
+import (
+    "go.opentelemetry.io/collector/confmap"
+    {{ if and .Metrics .ResourceAttributes -}}
+    "go.opentelemetry.io/collector/filter"
+    {{- end }}
+)
 {{ if .Metrics -}}
 
 // MetricConfig provides common config for a particular metric.
@@ -51,8 +51,10 @@ func DefaultMetricsConfig() MetricsConfig {
 // ResourceAttributeConfig provides common config for a particular resource attribute.
 type ResourceAttributeConfig struct {
 	Enabled bool `mapstructure:"enabled"`
+	{{- if .Metrics }}
 	Include []filter.Config `mapstructure:"include"`
 	Exclude []filter.Config `mapstructure:"exclude"`
+	{{- end }}
 
 	enabledSetByUser bool
 }

cmd/mdatagen/templates/metrics.go.tmpl

@@ -184,7 +184,7 @@ func NewMetricsBuilder(mbc MetricsBuilderConfig, settings receiver.CreateSetting
 	}
 	{{- end }}
 	{{- if $attr.Warnings.IfConfigured }}
-	if mbc.ResourceAttributes.{{ $name.Render }}.enabledSetByUser {
+	if mbc.ResourceAttributes.{{ $name.Render }}.enabledSetByUser || mbc.ResourceAttributes.{{ $name.Render }}.Include != nil || mbc.ResourceAttributes.{{ $name.Render }}.Exclude != nil {
 		settings.Logger.Warn("[WARNING] `{{ $name }}` should not be configured: {{ $attr.Warnings.IfConfigured }}")
 	}
 	{{- end }}
@@ -284,16 +284,14 @@ func (mb *MetricsBuilder) EmitForResource(rmo ...ResourceMetricsOption) {
 		op(rm)
 	}
 	{{ if .ResourceAttributes -}}
-	for name, val := range rm.Resource().Attributes().AsRaw() {
-		if filter, ok := mb.resourceAttributeIncludeFilter[name]; ok {
-			if !filter.Matches(val) {
-				return
-			}
+	for attr, filter := range mb.resourceAttributeIncludeFilter {
+		if val, ok := rm.Resource().Attributes().Get(attr); ok && !filter.Matches(val.AsString()) {
+			return
 		}
-		if filter, ok := mb.resourceAttributeExcludeFilter[name]; ok {
-			if filter.Matches(val) {
-				return
-			}
+	}
+	for attr, filter := range mb.resourceAttributeExcludeFilter {
+		if val, ok := rm.Resource().Attributes().Get(attr); ok && filter.Matches(val.AsString()) {
+			return
 		}
 	}
 	{{- end }}