[cmd/opampsupervisor] support headers configuration for own telemetry (#37353)

This updates the configuration for reporting the collector's own
telemetry to
utilize the headers configuration passed in via opamp

Follows
#37346

---------

Signed-off-by: Alex Boten <[email protected]>

Author: codeboten

.chloggen/codeboten_add-support-for-headers.yaml

@@ -0,0 +1,27 @@
+# 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. filelogreceiver)
+component: opampsupervisor
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: add support for headers configuration for reporting own telemetry
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [37353]
+
+# (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:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# 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: []

cmd/opampsupervisor/supervisor/supervisor.go

@@ -869,19 +869,16 @@ func (s *Supervisor) setupOwnMetrics(_ context.Context, settings *protobufs.Tele
 	} else {
 		s.logger.Debug("Enabling own metrics pipeline in the config")
 
-		port, err := s.findRandomPort()
-		if err != nil {
-			s.logger.Error("Could not setup own metrics", zap.Error(err))
-			return
+		data := map[string]any{
+			"MetricsEndpoint": settings.DestinationEndpoint,
+			"MetricsHeaders":  []protobufs.Header{},
 		}
 
-		err = s.ownTelemetryTemplate.Execute(
-			&cfg,
-			map[string]any{
-				"PrometheusPort":  port,
-				"MetricsEndpoint": settings.DestinationEndpoint,
-			},
-		)
+		if settings.Headers != nil {
+			data["MetricsHeaders"] = settings.Headers.Headers
+		}
+
+		err := s.ownTelemetryTemplate.Execute(&cfg, data)
 		if err != nil {
 			s.logger.Error("Could not setup own metrics", zap.Error(err))
 			return

cmd/opampsupervisor/supervisor/supervisor_test.go

@@ -357,7 +357,13 @@ func Test_onMessage(t *testing.T) {
 				},
 			},
 			OwnMetricsConnSettings: &protobufs.TelemetryConnectionSettings{
-				DestinationEndpoint: "http://localhost:4318",
+				DestinationEndpoint: "http://127.0.0.1:4318",
+				Headers: &protobufs.Headers{
+					Headers: []*protobufs.Header{
+						{Key: "testkey", Value: "testval"},
+						{Key: "testkey2", Value: "testval2"},
+					},
+				},
 			},
 		})
 
@@ -1125,7 +1131,13 @@ func TestSupervisor_setupOwnMetrics(t *testing.T) {
 		require.NoError(t, err)
 
 		configChanged := s.setupOwnMetrics(context.Background(), &protobufs.TelemetryConnectionSettings{
-			DestinationEndpoint: "localhost",
+			DestinationEndpoint: "http://127.0.0.1:4318",
+			Headers: &protobufs.Headers{
+				Headers: []*protobufs.Header{
+					{Key: "testkey", Value: "testval"},
+					{Key: "testkey2", Value: "testval2"},
+				},
+			},
 		})
 
 		expectedOwnMetricsSection := `
@@ -1137,7 +1149,10 @@ service:
             exporter:
               otlp:
                 protocol: http/protobuf
-                endpoint: localhost
+                endpoint: http://127.0.0.1:4318
+                headers:
+                  "testkey": "testval"
+                  "testkey2": "testval2"
 `
 
 		assert.True(t, configChanged)

cmd/opampsupervisor/supervisor/templates/owntelemetry.yaml

@@ -8,3 +8,9 @@ service:
               otlp:
                 protocol: http/protobuf
                 endpoint: {{.MetricsEndpoint}}
+                {{- if .MetricsHeaders}}
+                headers:
+                {{- range $k := .MetricsHeaders}}
+                  "{{$k.Key}}": "{{$k.Value}}"
+                {{- end}}
+                {{- end}}