Some logs ignore the JSON log format setting

[jakubgs]

Describe the bug
Despite setting server.log_format to json two log lines appear to ignore the setting:

ERROR: [transport] Client received GoAway with error code ENHANCE_YOUR_CALM and debug data equal to ASCII "too_many_pings".

maxprocs: Leaving GOMAXPROCS=4: CPU quota undefined

To Reproduce
Steps to reproduce the behavior:

1. Start Cortex 1.21.1
2. Check logs

Expected behavior
All logs respect the selected json format.