In Grafana Cloud, I want to set up a Synthetics Monitoring check for SMTP with STARTTLS.
I setup the following Query/Response block and was expecting that the probe_ssl_earliest_cert_expiry metric is not logged and displayed in the dashboard.
However, the dashboard shows "No data" in the "SSL Expiry" panel.
Furthermore, if I add a third expected pattern to the Query/Response block, the checks will fail.
However when I run a Blackbox Exporter (which is what Grafana Synthetics monitoring is based on) locally with the following config, the check succeeds and the probe_ssl_earliest_cert_expiry metric is logged.
prober: tcp
http:
ip_protocol_fallback: true
follow_redirects: true
enable_http2: true
tcp:
preferred_ip_protocol: ip4
ip_protocol_fallback: true
query_response:
- expect: 220 .+ ESMTP
- send: STARTTLS
- expect: 220 .+ Ready to start TLS
- starttls: true
- send: EHLO bb.info
- expect: 250