Add env-filter-explorer example #3233
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The transitive dependency on itoa 0.4 does not compiles with stable
rust. Bump inferno to 0.12.1 to fix this.
```
❯ cargo check --examples
Checking serde v1.0.157
Checking tokio v1.43.0
Checking itoa v0.4.0
Checking tracing-macros v0.1.0 (/Users/joshka/local/tracing/tracing-macros)
error[E0554]: `#![feature]` may not be used on the stable release channel
--> /Users/joshka/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/itoa-0.4.0/src/lib.rs:13:31
|
13 | #![cfg_attr(feature = "i128", feature(i128_type, i128))]
| ^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: the feature `i128_type` has been stable since `1.26.0` and no longer requires an attribute to enable
```
```
❯ cargo tree -i itoa@0.4.0
itoa v0.4.0
└── num-format v0.4.0
└── inferno v0.11.6
[dev-dependencies]
└── tracing-examples v0.0.0 (/Users/joshka/local/tracing/examples)
```
This example demonstrates how to use the `tracing-subscriber` crate's `EnvFilter` type to filter log messages based on their metadata. The example provides a text area where users can input an environment filter string, and displays the log messages that would be captured by that filter.
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Motivation
On discord, Conrad suggested a website to experiment with env-filter syntax. I think a TUI in tree makes a pretty decent replacement, especially as the output can exactly match the output that a real user might see if they're configuring tracing_subscriber with the default values.
Solution
This example demonstrates how to use the
tracing-subscribercrate'sEnvFiltertype to filter log messages based on their metadata. Theexample provides a text area where users can input an environment filter
string, and displays the log messages that would be captured by that
filter.
There are preset filters that can be selected that show off the syntax.