Passing `--telemetry-project` causes immediate crash with no logs

[apexskier]

Bug Description

See example code below. I've tried a combo of other metrics related flags, without changing behavior.

Example code (or command)

docker run --rm gcr.io/cloud-sql-connectors/cloud-sql-proxy:2.20.0 my-project-id:region:name --telemetry-project my-project-id --debug-logs

This causes an immediate exit with status 1, no logs.

Steps to reproduce?

Seeing this through a docker invocation, both manually and against a local kubernetes cluster.

Environment

1. OS type and version: macOS 26.1
2. Cloud SQL Proxy version (./cloud-sql-proxy --version): see docker command above
3. Proxy invocation command (for example, ./cloud-sql-proxy --port 5432 INSTANCE_CONNECTION_NAME): see docker command above

Additional Details

No response

[panavenue]

Hi @apexskier , I just tried with the binary directly, seems working fine.

I wonder if this issue only happens when using docker?

[apexskier]

Still reproduces for me with docker.