node: improve pprof lifecycle (#9628)

config/config.go

@@ -423,6 +423,7 @@ type RPCConfig struct {
 	TLSKeyFile string `mapstructure:"tls_key_file"`
 
 	// pprof listen address (https://golang.org/pkg/net/http/pprof)
+	// FIXME: This should be moved under the instrumentation section
 	PprofListenAddress string `mapstructure:"pprof_laddr"`
 }
 
@@ -506,6 +507,10 @@ func (cfg *RPCConfig) IsCorsEnabled() bool {
 	return len(cfg.CORSAllowedOrigins) != 0
 }
 
+func (cfg *RPCConfig) IsPprofEnabled() bool {
+	return len(cfg.PprofListenAddress) != 0
+}
+
 func (cfg RPCConfig) KeyFile() string {
 	path := cfg.TLSKeyFile
 	if filepath.IsAbs(path) {
@@ -1201,6 +1206,10 @@ func (cfg *InstrumentationConfig) ValidateBasic() error {
 	return nil
 }
 
+func (cfg *InstrumentationConfig) IsPrometheusEnabled() bool {
+	return cfg.Prometheus && cfg.PrometheusListenAddr != ""
+}
+
 //-----------------------------------------------------------------------------
 // Utils