Cargo Features

etcdv3client has no features set by default.

[dependencies]
etcdv3client = { version = "0.4.0", features = ["tls", "gen"] }
tls

Enables tls of tonic

gen = tonic-build

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.

tonic-build build gen?