Implement tracing-log on core dynamic metadata

And now we reach the point of this commit series. tracing-log is now capable of implementing its dynamic metadata resolution on solely publicly available APIs*, and thus so can anyone else do the same. *Dispatch still uses #[doc(hidden)] APIs to create the value set. Figuring out how to best expose is still an open question.
tokio-rs · Jun 14, 2022 · 61a1379 · 61a1379
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commit 61a1379
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diff --git a/tracing-log/Cargo.toml b/tracing-log/Cargo.toml
@@ -26,7 +26,7 @@ log-tracer = []
 tracing-core = { path = "../tracing-core", version = "0.2"}
 log = { version = "0.4" }
 once_cell = "1.12"
-env_logger = { version = "0.8", optional = true }
+env_logger = { version = "0.9", optional = true }
 
 [dev-dependencies]
 tracing = { path = "../tracing", version = "0.2"}