So apparently my latest certificate renewal hasn't gone through yet, even though my config has worked for about 2 years straight now.
The message in the docker logs is as follows:
time="2022-06-17T21:47:14Z" level=error msg="Error renewing certificate from LE:
{*.xxx.com [xxx.com]}, error: one or more domains had a problem:\n[*.xxx.com] time limit exceeded: last error: NS dara.ns.cloudflare.com. returned
SERVFAIL for _acme-challenge.xxx.com.\n" ACME CA="https://acme-v02.api.lets
encrypt.org/directory" providerName=default.acme
What is causing this SERVFAIL message and what can I do to fix it?