tenthe opened a new issue, #4095:
URL: https://github.com/apache/streampipes/issues/4095
### Body
### Description
Add a feature that notifies administrators via email before certificates in
the certificate storage expire.
The notification system should run as a scheduled cron job and send reminder
emails based on configurable thresholds defined via environment variables.
### Requirements
* The system must send **email notifications to all admins** for
certificates that are nearing expiration.
* A **single email** should include **all certificates expiring within the
configured time window**.
* Email functionality must only be active when an email server is configured.
### Configuration
* **Enable & schedule job**
* `SP_CERTIFICATE_EXPIRY_CRON`
* Cron expression defining when the job runs
* Default: runs once every night (e.g. `0 0 * * *`)
* **Reminder thresholds**
* `SP_CERTIFICATE_EXPIRY_EMAIL_DAYS`
* Comma-separated list of integers representing days before expiration
when an email should be sent
* Example:
```env
SP_CERTIFICATE_EXPIRY_EMAIL_DAYS=30,14,7
```
* If unset or empty, email reminders are disabled
### StreamPipes Committer
I acknowledge that I am a maintainer/committer of the Apache StreamPipes
project.
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