A few fixes for prometheus

Author: ferranbt

internal/catalog.go

@@ -20,6 +20,7 @@ func init() {
 	register(&BuilderHub{})
 	register(&BuilderHubPostgres{})
 	register(&BuilderHubMockProxy{})
+	register(&nullService{})
 }
 
 func FindComponent(name string) ServiceGen {

internal/components.go

@@ -571,3 +571,13 @@ func (p *OpReth) Watchdog(out io.Writer, instance *instance, ctx context.Context
 	rethURL := fmt.Sprintf("http://localhost:%d", instance.service.MustGetPort("http").HostPort)
 	return watchChainHead(out, rethURL, 2*time.Second)
 }
+
+type nullService struct {
+}
+
+func (n *nullService) Run(service *Service, ctx *ExContext) {
+}
+
+func (n *nullService) Name() string {
+	return "null"
+}

internal/local_runner.go

@@ -950,7 +950,8 @@ func CreatePrometheusServices(manifest *Manifest, out *output) error {
 		WithTag("latest").
 		WithArgs("--config.file", "/data/prometheus.yaml").
 		WithPort("metrics", 9090, "tcp").
-		WithArtifact("/data/prometheus.yml", "prometheus.yaml")
+		WithArtifact("/data/prometheus.yaml", "prometheus.yaml")
+	srv.ComponentName = "null" // For now, later on we can create a Prometheus component
 	manifest.services = append(manifest.services, srv)
 
 	return nil