Noisy error logs "ALTS creds ignored. Not running on GCP and untrusted ALTS is not enabled."

[anaulin]

What version of gRPC and what language are you using?

1.75.1, Python

What operating system (Linux, Windows,...) and version?

Google App Engine

What runtime / compiler are you using (e.g. python version or version of gcc)

Python 3.13.6

What did you do?

Using google.cloud.secretmanager, despite successful calls to Google Secrets, every call spits out a log error:

E0000 00:00:1761081644.353534 18832362 alts_credentials.cc:93] ALTS creds ignored. Not running on GCP and untrusted ALTS is not enabled.

Note that I'm running on Google App Engine.

What did you expect to see?

I expect no noisy error logs.

What did you see instead?

Non-actionable error logs, despite successful requests:

E0000 00:00:1761081644.353534 18832362 alts_credentials.cc:93] ALTS creds ignored. Not running on GCP and untrusted ALTS is not enabled.

Anything else we should know about your project / environment?

As a workaround, one can suppress these logs with GRPC_VERBOSITY=NONE

[gtcooke94]

Are you using ALTS credentials with a gRPC Python client/server you've built, or is this just using that python client library?

[anaulin]

@gtcooke94 this is just using the Google Secrets Python library to connect to Google Cloud's Secret Manager.

[anaulin]

Oh, and I see this log message even when I'm running my server on App Engine, which makes the "Not running on GCP" message all the more confusing.