v0.35.2

docs/MONITORING.md

@@ -44,6 +44,14 @@ scrape_configs:
       - targets: ['127.0.0.1:9191']
 ```
 
+Certificate expiry is exported for every installed certificate, including manually uploaded ones: `rust_proxy_certificate_not_after_timestamp_seconds{certificate="…"}` and `rust_proxy_certificate_days_remaining{certificate="…"}` (negative after expiry). Values are read from the certificate files and refreshed at most every five minutes. Example alert:
+
+```yaml
+- alert: RustProxyCertificateExpiresSoon
+  expr: rust_proxy_certificate_days_remaining < 14
+  for: 1h
+```
+
 When using a bearer token, configure Prometheus `authorization` or `bearer_token_file` securely rather than embedding a clear token in an exported dashboard. Review `grafana/README.md` and `grafana/rustproxy-overview.json` for chart examples; `nagios/README.md` contains external check scripts.
 
 ## JSON metrics API for external dashboards