Please share a thread safe method to increment integers.

_Describe the issue here._

##### Relevant URLs
- https://docs.influxdata.com/flux/v0.x/data-types/basic/int/
- _Provide other relevant URLs (project issues, community threads, etc.)_
I am looking for something equivalent to prometheus counter function which increments a value based on previous value.
This makes it safer to use when multiple instances try to modify the same metric.

Start with the linked Flux integer documentation and compare the requested behavior with the Prometheus counter model described in the issue. Determine whether the documentation should explain an existing thread-safe increment method or clarify its absence; the work is done when the supported approach and its concurrency limitations are documented.

Written by the indexing model from the issue text.