feat: add pprof

This patch adds the pprof server feature to the instance sidecar container

Signed-off-by: Armando Ruocco <armando.ruocco@enterprisedb.com>

.wordlist.txt

@@ -123,6 +123,7 @@ pluginConfiguration
 podName
 postgres
 postgresql
+pprof
 primaryUpdateStrategy
 rbac
 rc

internal/cmd/instance/main.go

@@ -33,6 +33,12 @@ func NewCmd() *cobra.Command {
 		},
 	}
 
+	cmd.Flags().Bool("pprof-server",
+		false,
+		"If true it will start a pprof debug http server on localhost:6061. Defaults to false.",
+	)
+	_ = viper.BindPFlag("pprof-server", cmd.Flags().Lookup("pprof-server"))
+
 	_ = viper.BindEnv("namespace", "NAMESPACE")
 	_ = viper.BindEnv("cluster-name", "CLUSTER_NAME")
 	_ = viper.BindEnv("pod-name", "POD_NAME")

internal/cnpgi/instance/manager.go

@@ -33,7 +33,8 @@ func Start(ctx context.Context) error {
 	namespace := viper.GetString("namespace")
 
 	controllerOptions := ctrl.Options{
-		Scheme: scheme,
+		PprofBindAddress: getPprofServerAddress(),
+		Scheme:           scheme,
 		Client: client.Options{
 			// Important: the caching options below are used by
 			// controller-runtime only.
@@ -129,3 +130,11 @@ func generateScheme(ctx context.Context) *runtime.Scheme {
 
 	return result
 }
+
+func getPprofServerAddress() string {
+	if viper.GetBool("pprof-server") {
+		return "0.0.0.0:6061"
+	}
+
+	return ""
+}

web/docs/misc.md

@@ -74,3 +74,23 @@ spec:
 
 For a complete list of supported options, refer to the
 [official Barman Cloud documentation](https://docs.pgbarman.org/release/latest/).
+
+## Enable the pprof debug server for the sidecar
+
+You can enable the instance sidecar's pprof debug HTTP server by adding the `--pprof-server` flag to the container's
+arguments via `.spec.instanceSidecarConfiguration.additionalContainerArgs` in the `ObjectStore` resource.
+
+This starts a pprof server on port 6061 inside the Pod.
+
+### Example
+
+```yaml
+apiVersion: barmancloud.cnpg.io/v1
+kind: ObjectStore
+metadata:
+  name: my-store
+spec:
+  instanceSidecarConfiguration:
+    additionalContainerArgs:
+      - "--pprof-server"
+```