/exec API: drop session reconnection support (#487)

internal/command/controller/run.go

@@ -36,7 +36,6 @@ var noExperimentalRPCV2 bool
 var experimentalPingInterval time.Duration
 var experimentalDisableDBCompression bool
 var workerOfflineTimeout time.Duration
-var execSessionRetentionTTL time.Duration
 var execSSHConnectionKeepaliveInterval time.Duration
 var synthetic bool
 
@@ -92,8 +91,6 @@ func newRunCommand() *cobra.Command {
 		"duration (e.g. 60s or 5m30s) after which a worker is considered offline for the purposes "+
 			"of scheduling (no new VMs will be scheduled on such worker and already assigned VMs will be "+
 			"marked as failed)")
-	cmd.Flags().DurationVar(&execSessionRetentionTTL, "exec-session-retention-ttl", 10*time.Minute,
-		"duration to retain reconnectable exec session history after the command exits")
 	cmd.Flags().DurationVar(&execSSHConnectionKeepaliveInterval, "exec-ssh-connection-keepalive-interval", 30*time.Second,
 		"interval between SSH keepalive requests sent by the controller for shared exec connections")
 
@@ -156,7 +153,6 @@ func runController(cmd *cobra.Command, args []string) (err error) {
 		controller.WithListenAddr(address),
 		controller.WithDataDir(dataDir),
 		controller.WithWorkerOfflineTimeout(workerOfflineTimeout),
-		controller.WithExecSessionRetentionTTL(execSessionRetentionTTL),
 		controller.WithExecSSHConnectionKeepaliveInterval(execSSHConnectionKeepaliveInterval),
 		controller.WithLogger(logger),
 	}