Cargo Features

[dependencies]
msgpack-tracing = { version = "0.1.2", default-features = false, features = ["env-filter"] }
default = env-filter

The env-filter feature is set by default whenever msgpack-tracing is added without default-features = false somewhere in the dependency tree.

env-filter default

Enables env-filter of tracing-subscriber

msgpack-tracing has 2 features without comments.