Module duration 

Constants

DAY_DURATION

HOUR_DURATION

MILLI_DURATION

MINUTE_DURATION

SECOND_DURATION

WEEK_DURATION

YEAR_DURATION

Functions

display_duration

display Duration in Prometheus format

parse_duration

parses a string into a Duration, assuming that a year always has 365d, a week always has 7d, and a day always has 24h.