Times intervals between calls to start_interval/2. This is useful if you want to find out which part of a process took the longest time. It works out simpler than wrapping each part of the process in a timer, and guarentees no gaps in the timings.

The simplest way to use the timer is to store the timer state in the process memory, see OpenTelemetry.start_interval. This module should only be used directly if you do not want to use the process memory.