agama-project / agama / 12393411001

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feat(rust): add support to configure logging through AGAMA_LOG (#1843)

Logs for the `agama-web-server` services include a lot of zbus-related
information, which is not useful for the Agama use case. To have better
control over what is included in the logs, this pull request adds
support for setting logs directives using an environment variable called
`AGAMA_LOG.`

This variable works in a similar way to [env_logger's
RUST_LOG](https://docs.rs/env_logger/latest/env_logger/#enabling-logging)
but with some additions that you can find in [Tokio's

EnvFilter](https://docs.rs/tracing-subscriber/latest/tracing_subscriber/filter/struct.EnvFilter.html#directives)
documentation.

Setting `AGAMA_LOG` to `AGAMA_LOG=debug,zbus=info` allows filtering
those annoying messages.

Note: we could hard code `zbus=info` if needed.

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