logs and log formatting

[golfingal72]

Logs should be able to routed to a file, not simply stdout...

is there a way to control the output patterns on the log?

This type of log formatting is really untenable:

INFO request{method=POST uri=/ version=HTTP/1.1 otel.kind=server otel.status_code=}:router{query="query Query {\n ping\n}" operation_name="Query" client_name="" client_version="" otel.kind=internal}:execution{otel.kind=internal}:fetch{otel.kind=internal}:subgraph{name="favorite-dgs" otel.kind=internal}: router::plugins::hello_world:

dumping the whole request, each time you add a simple output statement.. the whole request is dumped. When you have large queries, the logs just fill with garbage...

[golfingal72]

the log4rs package works like a charm... consider using that

you can configure the logs in a yaml file

[garypen]

Logs always go to stdout. It's fairly trivial to re-direct to a file and most modern applications just log to stdout.

If your output destination is not a tty, then the router produces JSON logs. From there, it's simple to use jq to filter, map, transform output however you like.

Would it be helpful to add some jq logging examples in our docs?

Also: see #694.
Also: --log will accept an EnvFilter and you can do some quite sophisticated filtering using this feature.