Have vttablet validate and populate _vt.local_metadata on start up when orchestrator flags are present

[brybry192]

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vitess/go/vt/vttablet/tabletmanager/restore.go

Line 186 in 2e94e3e

func (agent *ActionAgent) getLocalMetadataValues(tabletType topodatapb.TabletType) map[string]string {

Feature Description

Have vttablet validate and populate _vt.local_metadata on start up when orchestrator flags are present on the command line. A quick scan of the code indicates that this workflow is only executed during the backup/restore procedure by mysqlctld. If managing mysql directly without mysqlctld, the metadata does not get populated and orchestrator is unable to determine the tablet alias needed during failover.

Use Case(s)

mysql managed independently of mysqlctld.

[sougou]

Dup of #4115

[sougou]

Fixed in #4403