[service] use mdatagen for service metrics

This reverts the reverts open-telemetry#10271 and adds a mechanism to skip adding a create settings method for the service package component test. Will need to figure out if servicetelemetry.TelemetrySettings should be renamed to fit w/ the other CreateSettings structs before removing this check.

Signed-off-by: Alex Boten <223565+codeboten@users.noreply.github.com>

cmd/mdatagen/loader.go

@@ -228,8 +228,9 @@ type tests struct {
 }
 
 type telemetry struct {
-	Level   configtelemetry.Level `mapstructure:"level"`
-	Metrics map[metricName]metric `mapstructure:"metrics"`
+	SkipCreateSettings bool                  `mapstructure:"skip_create_settings"`
+	Level              configtelemetry.Level `mapstructure:"level"`
+	Metrics            map[metricName]metric `mapstructure:"metrics"`
 }
 
 type metadata struct {

cmd/mdatagen/templates/component_telemetry_test.go.tmpl

@@ -21,6 +21,7 @@ type componentTestTelemetry struct {
 	meterProvider *sdkmetric.MeterProvider
 }
 
+{{- if not .Telemetry.SkipCreateSettings }}
 func (tt *componentTestTelemetry) NewCreateSettings() {{ .Status.Class }}.CreateSettings {
 	settings := {{ .Status.Class }}test.NewNopCreateSettings()
 	settings.MeterProvider = tt.meterProvider
@@ -29,6 +30,8 @@ func (tt *componentTestTelemetry) NewCreateSettings() {{ .Status.Class }}.Create
 	return settings
 }
 
+{{- end }}
+
 func setupTestTelemetry() componentTestTelemetry {
 	reader := sdkmetric.NewManualReader()
 	return componentTestTelemetry{

service/metadata.yaml

@@ -15,6 +15,7 @@ tests:
         - "go.opentelemetry.io/collector/service/internal/proctelemetry.InitPrometheusServer.func1"
 
 telemetry:
+  skip_create_settings: true
   metrics:
     process_uptime:
       enabled: true