How to change the log format of Uvicorn access logs?

[psheichelberg]

I would like to change the format of the access logs to JSON (open_telemetry).

I had a look at the source code and it seems to me that the log format of the Uvicorn access cannot be changed: https://github.com/keephq/keep/blob/v0.49.0/keep/api/logging.py#L377_L380

But maybe I am missing or misunderstanding something.

Is there a way to change the log format of the access logs to JSON?

Thank you in advance!

[dosubot[bot]]

Hi @psheichelberg! I'm Dosu and I’m helping the keep team.

You're correct — the Uvicorn access log format is currently hardcoded and cannot be changed to JSON via configuration.

The LOG_FORMAT environment variable only affects the main application logs, not Uvicorn access logs. The access logs use a separate plain-text formatter:

"uvicorn_access": {
    "format": "%(asctime)s - %(otelTraceID)s - %(threadName)s - %(message)s"
}

The good news is that Keep already has a CustomJsonFormatter class used for the main application logs. To enable JSON for access logs, you'd need to modify logging.py to apply this formatter to the uvicorn_access handler — something like:

"uvicorn_access": {
    "()": CustomJsonFormatter,
    "fmt": "%(asctime)s %(message)s %(otelTraceID)s %(threadName)s",
    "rename_fields": {
        "asctime": "timestamp",
        "otelTraceID": "logging.googleapis.com/trace",
    },
}

This would be a reasonable feature request if you'd like to open one — the infrastructure is already there, it's just not wired up for access logs.

To reply, just mention @dosu.

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