tracing
This version has 20 feature flags, 4 of them enabled by default.
default
std
attributes
tracing-attributes
valuable
log-always
release_max_level_error
max_level_warn
max_level_trace
release_max_level_debug
release_max_level_info
max_level_debug
release_max_level_warn
max_level_info
max_level_off
release_max_level_off
max_level_error
async-await
log
release_max_level_trace