Reboot Discovery Listener (#14487)

* Add Current Changes To Routine

* Add In New Test

* Add Feature Flag

* Add Discovery Rebooter feature

* Do Not Export Mutex And Use Zero Value Mutex

* Wrap Error For Better Debugging

* Fix Function Name and Add Specific Test For it

* Manu's Review

config/features/config.go

@@ -78,6 +78,8 @@ type Flags struct {
 	SaveInvalidBlock bool // SaveInvalidBlock saves invalid block to temp.
 	SaveInvalidBlob  bool // SaveInvalidBlob saves invalid blob to temp.
 
+	EnableDiscoveryReboot bool // EnableDiscoveryReboot allows the node to have its local listener to be rebooted in the event of discovery issues.
+
 	// KeystoreImportDebounceInterval specifies the time duration the validator waits to reload new keys if they have
 	// changed on disk. This feature is for advanced use cases only.
 	KeystoreImportDebounceInterval time.Duration
@@ -260,6 +262,10 @@ func ConfigureBeaconChain(ctx *cli.Context) error {
 		logEnabled(DisableCommitteeAwarePacking)
 		cfg.DisableCommitteeAwarePacking = true
 	}
+	if ctx.IsSet(EnableDiscoveryReboot.Name) {
+		logEnabled(EnableDiscoveryReboot)
+		cfg.EnableDiscoveryReboot = true
+	}
 
 	cfg.AggregateIntervals = [3]time.Duration{aggregateFirstInterval.Value, aggregateSecondInterval.Value, aggregateThirdInterval.Value}
 	Init(cfg)

config/features/flags.go

@@ -170,6 +170,10 @@ var (
 		Name:  "disable-committee-aware-packing",
 		Usage: "Changes the attestation packing algorithm to one that is not aware of attesting committees.",
 	}
+	EnableDiscoveryReboot = &cli.BoolFlag{
+		Name:  "enable-discovery-reboot",
+		Usage: "Experimental: Enables the discovery listener to rebooted in the event of connectivity issues.",
+	}
 )
 
 // devModeFlags holds list of flags that are set when development mode is on.
@@ -227,6 +231,7 @@ var BeaconChainFlags = append(deprecatedBeaconFlags, append(deprecatedFlags, []c
 	BlobSaveFsync,
 	EnableQUIC,
 	DisableCommitteeAwarePacking,
+	EnableDiscoveryReboot,
 }...)...)
 
 // E2EBeaconChainFlags contains a list of the beacon chain feature flags to be tested in E2E.