Feature flags of tracing-subscriber crate // Lib.rs

Cargo Features

[dependencies]
tracing-subscriber = { version = "0.3.18", default-features = false, features = ["std", "alloc", "env-filter", "fmt", "ansi", "registry", "json", "valuable", "local-time", "smallvec", "tracing-log", "parking_lot", "chrono"] }

default = ansi, fmt, smallvec, std, tracing-log

These default features are set whenever tracing-subscriber is added without default-features = false somewhere in the dependency tree.

std default env-filter? fmt registry? = alloc

Enables std of tracing-core

Affects registry::SpanData.extensions, registry::SpanData.extensions_mut, util::SubscriberInitExt.set_default, layer::Layer.with_filter, layer::Layer.boxed…

alloc std

Affects layer::Layer.boxed…

env-filter = matchers, once_cell, regex, std, thread_local, tracing

fmt default ansi = registry, std

ansi default = fmt, nu-ansi-term

registry fmt = sharded-slab, std, thread_local

Affects layer_filters::FilterId, registry::LookupSpan.register_filter, registry::SpanData.is_enabled_for, sharded::Registry, sharded::Data, layer::Layer.with_filter…

json = serde, serde_json, tracing-serde

Affects format::json…

valuable = valuable-serde, valuable_crate

Enables valuable of tracing-core and tracing-serde

local-time

Enables support for local time when using the time crate timestamp formatters.

Enables local-offset of time

Enable the time crate's macros feature, for examples.

Affects time_crate::LocalTime…

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

tracing env-filter?

Enables tracing