Add OTLP_DSN default env, make otel optional in SDK (0.1.70)

Chart now sets OTLP_DSN=http://token@tinysystems-otel-collector:2345
by default so modules connect to otel-collector out of the box.

SDK: skip otel setup when OTLP_DSN is empty instead of os.Exit(1).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: maksymlumen

charts/tinysystems-operator/Chart.yaml

@@ -13,7 +13,7 @@ type: application
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 0.1.69
+version: 0.1.70
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application. Versions are not expected to
 # follow Semantic Versioning. They should reflect the version the application is using.

charts/tinysystems-operator/values.yaml

@@ -9,7 +9,9 @@ controllerManager:
       - pre-delete
     installArgs:
       - pre-install
-    extraEnv: []
+    extraEnv:
+      - name: OTLP_DSN
+        value: "http://token@tinysystems-otel-collector:2345"
     containerSecurityContext:
       allowPrivilegeEscalation: false
       capabilities:

cli/run.go

@@ -91,17 +91,22 @@ var runCmd = &cobra.Command{
 
 		// re-use zerolog
 		l := zerologr.New(&log.Logger)
-		err := metrics.ConfigureOpenTelemetry(
-			metrics.WithDSN(os.Getenv("OTLP_DSN")),
-			metrics.WithBatchSpanProcessorOption(func(o *sdktrace.BatchSpanProcessorOptions) {
-				o.BatchTimeout = 500 * time.Millisecond // Very responsive
-				// Optional: also reduce batch size for faster sends
-				o.MaxExportBatchSize = 10
-			}),
-		)
-		if err != nil {
-			l.Error(err, "configure opentelemetry error")
-			os.Exit(1)
+		otlpDSN := os.Getenv("OTLP_DSN")
+		if otlpDSN != "" {
+			err := metrics.ConfigureOpenTelemetry(
+				metrics.WithDSN(otlpDSN),
+				metrics.WithBatchSpanProcessorOption(func(o *sdktrace.BatchSpanProcessorOptions) {
+					o.BatchTimeout = 500 * time.Millisecond // Very responsive
+					// Optional: also reduce batch size for faster sends
+					o.MaxExportBatchSize = 10
+				}),
+			)
+			if err != nil {
+				l.Error(err, "configure opentelemetry error")
+				os.Exit(1)
+			}
+		} else {
+			l.Info("OTLP_DSN not set, telemetry disabled")
 		}
 
 		// Send buffered spans and free resources.