refactor: enhance bird metrics polling with context support

Updated the `startBirdMetricsPoller` function to accept a context parameter, allowing for better control over the polling lifecycle. This change was applied in both `evobgp-all` and `evobgp-api` main files. Additionally, modified the `StartBirdProtocolsPoller` function to handle context cancellation, ensuring graceful shutdown of the polling routine. Introduced a new service in the Docker Compose configuration for logging runtime service outputs, improving observability during deployment.

internal/observability/metrics.go

@@ -196,14 +196,15 @@ func (s *statusRecorder) WriteHeader(code int) {
 }
 
 // StartBirdProtocolsPoller runs birdc "show protocols" on interval when socket is non-empty.
-func StartBirdProtocolsPoller(socket string, birdcPath string, interval time.Duration, showFn func(ctx context.Context, socket, birdcBin string) (string, error), countFn func(output string) int) {
+// Горутина завершается при отмене ctx (корректное завершение вместе с процессом API).
+func StartBirdProtocolsPoller(ctx context.Context, socket string, birdcPath string, interval time.Duration, showFn func(ctx context.Context, socket, birdcBin string) (string, error), countFn func(output string) int) {
 	socket = trimSpace(socket)
-	if socket == "" || interval <= 0 || showFn == nil || countFn == nil {
+	if ctx == nil || socket == "" || interval <= 0 || showFn == nil || countFn == nil {
 		return
 	}
 	scrape := func() {
-		ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
-		out, err := showFn(ctx, socket, birdcPath)
+		sctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+		out, err := showFn(sctx, socket, birdcPath)
 		cancel()
 		if err != nil {
 			SetBirdSessionMetrics(0, false)
@@ -215,8 +216,13 @@ func StartBirdProtocolsPoller(socket string, birdcPath string, interval time.Dur
 		scrape()
 		t := time.NewTicker(interval)
 		defer t.Stop()
-		for range t.C {
-			scrape()
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			case <-t.C:
+				scrape()
+			}
 		}
 	}()
 }