This is the mega issue to clean up Finch Chirp alert when removing Launcher metrics.

We got many Finch Chirp on metrics with "dataset is empty", e.g. 
https://groups.google.com/a/google.com/forum/#!msg/finch-chirp/QfSyQ2jfhHk/kg74fEgdAgAJ

Please double check:
1. Removing the metrics is intentional.
2. Please clean up Finch Chirp alert following here:
https://g3doc.corp.google.com/analysis/uma/g3doc/chirp/chirp_interpretation.md?cl=head#dataset_empty