feat(lib): expose WEIGH matches as prometheus metrics

Signed-off-by: Xe Iaso <me@xeiaso.net>

docs/docs/CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 <!-- This changes the project to: -->
 
+- Expose WEIGHT rule matches as Prometheus metrics.
 - Allow more OCI registry clients [based on feedback](https://github.com/TecharoHQ/anubis/pull/1253#issuecomment-3506744184).
 - Expose services directory in the embedded `(data)` filesystem.
 - Add Ukrainian locale ([#1044](https://github.com/TecharoHQ/anubis/pull/1044)).

lib/anubis.go

@@ -576,6 +576,7 @@ func (s *Server) check(r *http.Request, lg *slog.Logger) (policy.CheckResult, *p
 				return cr("bot/"+b.Name, b.Action, weight), &b, nil
 			case config.RuleWeigh:
 				lg.Debug("adjusting weight", "name", b.Name, "delta", b.Weight.Adjust)
+				policy.Applications.WithLabelValues("bot/"+b.Name, "WEIGH").Add(1)
 				weight += b.Weight.Adjust
 			}
 		}