Application shutdown shouldn't fail healthchecks

[com6056]

Support guidelines

• [x] I've read the support guidelines

I've found a bug and checked that ...

• [x] ... the documentation does not mention anything about my problem
• [x] ... there are no open or closed issues that are related to my problem

Description

Right now, application shutdown triggers healthcheck failures which leads to notifications: https://github.com/crazy-max/diun/blob/e99c10917da848ab3397b5b5fa67e7cef3a58fa5/internal/app/diun.go#L196

This includes things like simply restarting diun, which probably shouldn't notify.

Expected behaviour

I would expect healthcheck failures to only trigger when there is an issue running diun (or when diun hasn't run in a certain amount of time, which healthchecks.io already handles for you).

Actual behaviour

healthchecks.io notifies you of a diun failure whenever you restart diun.

Steps to reproduce

1. Restart diun
2. Get a healthchecks.io failure notification

Diun version

v4.29.0

Docker info

N/A

Docker Compose config

Logs

Fri, 08 Aug 2025 23:53:28 UTC WRN Caught signal terminated

Additional info

No response