Error sending VM ready time metrics

Hi,

following message appears in the log:

ERROR vmagereceiver/vm_age_collector.go:151 Error sending VM ready time metrics {"component_kind": "receiver", "component_type": "vmage", "component_name": "vmage", "error": "rpc error: code = InvalidArgument desc = One or more TimeSeries could not be written: Unknown metric: appengine.googleapis.com/flex/internal/vm_ready_time: timeSeries[0]

Everything was created automatically while setting up a server-side Container in Google Tag Manager. Then the server was switched to production. How could I fix this, and is this fixable on my side?

Thanks in advance!