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tracing-subscriber: document that directives are comma-separated #1637

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Oct 13, 2021
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tracing-subscriber: document that directives are comma-separated #1637

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5 changes: 4 additions & 1 deletion tracing-subscriber/src/filter/env/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,7 @@ use tracing_core::{
///
/// # Directives
///
/// A filter consists of one or more directives which match on [`Span`]s and [`Event`]s.
/// A filter consists of one or more comma-separated directives which match on [`Span`]s and [`Event`]s.
/// Each directive may have a corresponding maximum verbosity [`level`] which
/// enables (e.g., _selects for_) spans and events that match. Like `log`,
/// `tracing` considers less exclusive levels (like `trace` or `info`) to be more
Expand Down Expand Up @@ -78,6 +78,9 @@ use tracing_core::{
/// - `tokio::net=info` will enable all spans or events that:
/// - have the `tokio::net` target,
/// - at the level `info` or above.
/// - `warn,tokio::net=info` will enable all spans and events that:
/// - are at the level `warn` or above, *or*
/// - have the `tokio::net` target at the level `info` or above.
/// - `my_crate[span_a]=trace` will enable all spans and events that:
/// - are within the `span_a` span or named `span_a` _if_ `span_a` has the target `my_crate`,
/// - at the level `trace` or above.
Expand Down