## What Happening
A certificate that cert-manager is maintaining will expired

## Related Issues or Alerts
> Parse issue or alert link 

## Diagnosis
> How to investigate the problem

## Solution
A certificate that the cert-manager is maintaining is due to expire within X days. Typically ACME certs are updated 30 days before expiry, so this is unusual.

Ensure the certificate issuer is configured correctly. Check cert-manager logs for errors renewing this certificate.

NOTE: Versions of cert-manager before 0.16.0 do not remove metrics for deleted certificates. Rolling the cert-manager or upgrading the cert-manager should resolve this.

## Post-Check
The alert will auto-resolve when issue fixed