monitoring/alloy: drop cosmetic calico-typha 'Endpoints deprecated' warning

calico-typha (~342 lines/hr across 3 pods) still WATCHes the core v1
Endpoints API, so the apiserver returns the 'v1 Endpoints is deprecated
in v1.33+' client-go warning, which typha logs. Per KEP-4974 the v1
Endpoints API will essentially never be removed (clients keep working
indefinitely), and even the latest Calico still watches Endpoints
(projectcalico/calico#11540) so a CNI upgrade would not fix it. Pure
cosmetic noise. Targeted Alloy stage.drop (calico-system ns, exact
deprecation message), mirroring the mailserver drop. Real calico
warnings/errors kept; reversible. Validated with alloy fmt (exit 0).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

stacks/monitoring/modules/monitoring/alloy.yaml

@@ -149,6 +149,20 @@ alloy:
           }
         }
 
+        // Drop the cosmetic k8s deprecation warning calico-typha emits because
+        // it still WATCHes the core v1 Endpoints API (~342 lines/hr across 3
+        // typha pods). The v1 Endpoints API will essentially never be removed
+        // (KEP-4974), so this is pure log noise — Calico is healthy and no
+        // Calico release has moved typha's watch to EndpointSlice. Real
+        // calico-system warnings/errors are KEPT. Reversible — delete to ship.
+        stage.match {
+          selector = `{namespace="calico-system"}`
+          stage.drop {
+            expression          = `.*v1 Endpoints is deprecated in v1\.33\+; use discovery\.k8s\.io/v1 EndpointSlice.*`
+            drop_counter_reason = "calico_endpoints_deprecation_warning"
+          }
+        }
+
         stage.static_labels {
             values = {
               cluster = "default",