What are the "unspecified" credentials in the YouTube Data API v3 Metrics dashboard?

Rei*_*ldo 5 api metrics credentials youtube-data-api

I'm tracing the calls to the YouTube Data API v3 from my application in order to check on quota overflows and when I look at the "Metrics" dashboards under "credentials" I see other = unspecified with lots of calls. But all my calls use API KEYs.

Does anyone know what this other = unspecified is?

Youtube DATA API 指标仪表板