Timer function starts for every instance in hub

I have a timer function set to run every 15 minutes. `*/15 * * * * *`

What I am seeing is that every 15 minutes the function begins executing `n` times where `n` is the number of instances of my function app i have running. Theres a lot of vague documentation stating that timer functions will only execute concurrently at most one time but I'm not sure if that guidance exactly matches up with this scenario.


Start by reviewing the Azure Functions timer-trigger documentation and the reported `*/15 * * * * *` schedule in the context of multiple function-app instances. Determine whether the single-execution guidance applies across instances; done should mean the expected behavior is established and the issue has a clearly identified fix or documentation update.

Written by the indexing model from the issue text.