fix(cmd/anubis): add signal handling to metrics server (#856)

This fixes a bug that was introduced in 68b653b0, in which the call
to metricsServer was passed a plain context.Background without
signal handling.

This commit adds back in the signal handling for the metrics server,
as well as for the Thoth client and storage backend.

Closes: #853

Signed-off-by: Emily Rowlands <emily@erowl.net>

cmd/anubis/main.go

@@ -263,7 +263,10 @@ func main() {
 		return
 	}
 
-	ctx := context.Background()
+	// install signal handler
+	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer stop()
+
 	wg := new(sync.WaitGroup)
 
 	if *metricsBind != "" {
@@ -414,10 +417,6 @@ func main() {
 		log.Fatalf("can't construct libanubis.Server: %v", err)
 	}
 
-	// install signal handler
-	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
-	defer stop()
-
 	var h http.Handler
 	h = s
 	h = internal.RemoteXRealIP(*useRemoteAddress, *bindNetwork, h)

docs/docs/CHANGELOG.md

@@ -13,6 +13,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 <!-- This changes the project to: -->
 
+- Fix hanging on service restart ([#853](https://github.com/TecharoHQ/anubis/issues/853))
+
 ## v1.21.0: Minfilia Warde
 
 > Please, be at ease. You are among friends here.