feat: JSON output format for log messages #653
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would be interesting to stress test EC2 with heavy writes and see how IOPS react 🤔 |
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chasers
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Jun 2, 2025
Output logs in line JSON format (JSON object per line) in format that is as similar to the format that is expected by the Logflare as possible. The idea there is to log to the Vector which will then take care of logging to file(s) and to dispatch the logs to Logflare.
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Output logs in line JSON format (JSON object per line) in format that is as similar to the format that is expected by the Logflare as possible.
The idea there is to log to the Vector which will then take care of logging to file(s) and to dispatch the logs to Logflare.
It provides 3 new ENV variables that we need to set in deployment:
SUPAVISOR_LOG_FILE_PATH=<path>- path to file where we want to store our logs. These logs are automatically rotated and up to 5 files (each max 8 MiB, though I think we can make it configurable or larger) are storedSUPAVISOR_LOG_FORMAT=jsonto output logs in Logflare JSON formatSUPAVISOR_ACCESS_LOG_FILE_PATH=<path>- path to access log forfail2banprocessingThat is current approach. I also started using
SUPAVISOR_prefix to all (new) environment variables that are used to configure Supavisor, to easily scan for variables that we are defining. Current uses of Logflare will work as is, that behaviour is not removed, but the Supavisor will log to stdout (or file if specified) by default now. I wonder whether we should always log to stdout and log to file in addition to logging to stdout. That is open and that is almost one line change if needed.This module https://github.com/supabase/supavisor/pull/653/files#diff-fcb4c5de26c4fdbe08d536956db8eb369be522fa167e1c43638c936caa9684b4 would probably need to be exported to some new Logflare library (cc @Ziinc), but for simplicity it is currently in Supavisor. I haven't yet written proper test for it.
I also have added new metadata field for logs in
ClientHandler-state. It contains the connection state at the time of log. It is mostly useful for logging access logs (as these are heavily limited) where I log only events inexchangestate (as it is where all connection failures happen). I also set logger metadata much earlier in the connection setup to be able to see all that info ASAP.This code also utilises new
JSONmodule in Elixir, so it requires fairly recent (1.18) Elixir and OTP 27+.