Allow per-component logging configuration via environment variables

[dfawley]

[easwars]

We did add the per component logging capability with https://github.com/grpc/grpc-go/blob/master/grpclog/component.go.

@dfawley : With this issue, did you envision having environment variables on a per component level where the verbosity and severity can be set?

[easwars]

This doesn't seem like a small enough issue which can be fixed as part of the fixit. But assigning the label anyways so that we can discuss it and make a call.

[ZhouyihaiDing]

Hi, I am wondering if we can add a check for GRPC_GO_LOG_SEVERITY_LEVEL in glogger.

[dfawley]

@ZhouyihaiDing this issue is unrelated. Please send me a chat message to discuss or file a new issue, thanks!

[thefallentree]

what is the current way of showing these internal log messages? Even through code?

[easwars]

what is the current way of showing these internal log messages? Even through code?

I'm not sure I understand your question. But we currently have two environment variables that control the logging level and the verbosity: GRPC_GO_LOG_VERBOSITY_LEVEL and GRPC_GO_LOG_SEVERITY_LEVEL.