The plug was incorrectly placed in the endpoint, causing it to run on
all requests including APIs. Moved to :browser pipeline where it belongs,
and removed redundant fetch_session call since the pipeline handles it.
Plug.Parsers was trying to parse protobuf bodies as JSON, failing with
400 errors before the request reached the controller.
Changes:
- Added custom BodyReader to endpoint that skips parsing for protobuf
- When Content-Type is application/x-protobuf, return empty body to parser
- Controller reads the raw body directly for protobuf requests
- Added error handling for protobuf decode failures in heartbeat endpoint
This fixes the 400 errors agents were seeing on heartbeat requests.
Use Plug.Telemetry's dynamic log level feature to disable logging for
/health requests. This is the proper Phoenix way to exclude specific
endpoints from request logs.
- Add log_level/1 function to endpoint that returns false for /health
- Configure Plug.Telemetry to use dynamic log level
- Remove log: false from router (handled by endpoint now)
This prevents Kubernetes health probe spam in application logs.
