mox/tlsrpt
Mechiel Lukkien afb182cb14
smtpserver: add prometheus metric for failing starttls handshakes for incoming deliveries
and add an alerting rule if the failure rate becomes >10% (e.g. expired
certificate).

the prometheus metrics includes a reason, including potential tls alerts, if
remote smtp clients would send those (openssl s_client -starttls does).

inspired by issue #237, where incoming connections were aborted by remote. such
errors would show up as "eof" in the metrics.
2024-11-29 12:43:21 +01:00
..
2023-01-30 14:27:06 +01:00