[service] Add service::telemetry::metrics::views config key

.chloggen/service-telemetry-views.yaml

@@ -0,0 +1,32 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: service
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add config key to set metric views used for internal telemetry
+
+# One or more tracking issues or pull requests related to the change
+issues: [10769]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext: |
+  The `service::telemetry::metrics::views` config key can now be used to explicitly set the list of
+  metric views used for internal telemetry, mirroring `meter_provider::views` in the SDK config.
+  This can be used to disable specific internal metrics, among other uses.
+
+  This key will cause an error if used alongside other features which would normally implicitly create views, such as:
+  - not setting `service::telemetry::metrics::level` to `detailed`;
+  - enabling the `telemetry.disableHighCardinalityMetrics` feature flag.
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [user]

service/service.go

@@ -137,7 +137,15 @@
 
 	sch := semconv.SchemaURL
 
-	views := configureViews(cfg.Telemetry.Metrics.Level)
+	var views []config.View
+	if cfg.Telemetry.Metrics.Views != nil {
+		if disableHighCardinalityMetricsFeatureGate.IsEnabled() {
+			return nil, errors.New("telemetry.disableHighCardinalityMetrics gate is incompatible with setting views explicitly")
+		}
+		views = cfg.Telemetry.Metrics.Views
+	} else {
+		views = configureViews(cfg.Telemetry.Metrics.Level)
+	}
 
 	readers := cfg.Telemetry.Metrics.Readers
 	if cfg.Telemetry.Metrics.Level == configtelemetry.LevelNone {
@@ -404,9 +412,19 @@
 func configureViews(level configtelemetry.Level) []config.View {
 	views := []config.View{}
 
-	if disableHighCardinalityMetricsFeatureGate.IsEnabled() {
-		views = append(views, []config.View{
-			{
+	if level < configtelemetry.LevelDetailed {
+		// Drop all otelhttp and otelgrpc metrics if the level is not detailed.
+		views = append(views,
+			dropViewOption(&config.ViewSelector{
+				MeterName: ptr("go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"),
+			}),
+			dropViewOption(&config.ViewSelector{
+				MeterName: ptr("go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"),
+			}),
+		)
+	} else if disableHighCardinalityMetricsFeatureGate.IsEnabled() {
+		views = append(views,
+			config.View{
 				Selector: &config.ViewSelector{
 					MeterName: ptr("go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"),
 				},
@@ -420,7 +438,7 @@
 					},
 				},
 			},
-			{
+			config.View{
 				Selector: &config.ViewSelector{
 					MeterName: ptr("go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"),
 				},
@@ -433,18 +451,6 @@
 					},
 				},
 			},
-		}...)
-	}
-
-	if level < configtelemetry.LevelDetailed {
-		// Drop all otelhttp and otelgrpc metrics if the level is not detailed.
-		views = append(views,
-			dropViewOption(&config.ViewSelector{
-				MeterName: ptr("go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"),
-			}),
-			dropViewOption(&config.ViewSelector{
-				MeterName: ptr("go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"),
-			}),
 		)
 	}
 

service/telemetry/config.go

@@ -111,5 +111,9 @@
 		return errors.New("collector telemetry metrics reader should exist when metric level is not none")
 	}
 
+	if c.Metrics.Views != nil && c.Metrics.Level != configtelemetry.LevelDetailed {
+		return errors.New("metric views can only be set when level is detailed")
+	}
+
 	return nil
 }

service/telemetry/internal/migration/v0.3.0.go

@@ -69,6 +69,11 @@ type MetricsConfigV030 struct {
 	// Readers allow configuration of metric readers to emit metrics to
 	// any number of supported backends.
 	Readers []config.MetricReader `mapstructure:"readers"`
+
+	// Views allows advanced configuration of emitted metrics by setting
+	// the list of views passed to the SDK.
+	// This is incompatible with `level` values other than `detailed`.
+	Views []config.View `mapstructure:"views"`
 }
 
 func (c *MetricsConfigV030) Unmarshal(conf *confmap.Conf) error {