Merge pull request #159924 from jasonlmfong/blathers/backport-release-26.1-159909

release-26.1: ts: rename cluster setting for child metrics collection

Author: dhartunian

pkg/server/status/recorder.go

@@ -116,7 +116,7 @@ var bugfix149481Enabled = settings.RegisterBoolSetting(
 // This setting enables debugging of changefeeds and should not be considered functionality
 // to expand support for.
 var ChildMetricsStorageEnabled = settings.RegisterBoolSetting(
-	settings.ApplicationLevel, "timeseries.child_metrics.enabled",
+	settings.ApplicationLevel, "timeseries.persist_child_metrics.enabled",
 	"enables the collection of high-cardinality child metrics into the time series database",
 	false,
 	settings.WithVisibility(settings.Reserved))