Finish RAILIANCE-WP-0016 apps-pg resource evidence

Publish capacity, recovery, labor, and allocation-driver evidence for
resource:railiance:apps-pg so resource-control can forecast and allocate
without reading application data or inventing booked cost.

docs/evidence/RAILIANCE-WP-0016-apps-pg-observation.json

@@ -0,0 +1,139 @@
+{
+  "schema_version": "0.1",
+  "record_type": "usage_observation",
+  "resource_id": "resource:railiance:apps-pg",
+  "source": "railiance-platform",
+  "workplan_id": "RAILIANCE-WP-0016",
+  "reef": "reef-railiance",
+  "captured_at": "2026-08-14T00:04:19Z",
+  "identity": {
+    "cluster": "apps-pg",
+    "namespace": "databases",
+    "pod": "apps-pg-1",
+    "image": "ghcr.io/cloudnative-pg/postgresql:16",
+    "postgres_version": "PostgreSQL 16.13 (Debian 16.13-1.pgdg11+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 10.2.1-6) 10.2.1 20210110, 64-bit",
+    "created_at": "2026-08-09T00:15:53Z",
+    "phase": "Cluster in healthy state"
+  },
+  "capacity": {
+    "instances_provisioned": 1,
+    "instances_ready": 1,
+    "cpu_request": null,
+    "memory_request": null,
+    "cpu_limit": null,
+    "memory_limit": null,
+    "storage_provisioned": "10Gi",
+    "storage_class": "local-path",
+    "max_connections": 100
+  },
+  "utilization": {
+    "cpu_observed": "9m",
+    "memory_observed": "102Mi",
+    "pgdata_bytes": 619083120,
+    "wal_bytes_since_init": 587202560,
+    "sessions": 7,
+    "databases": [
+      {
+        "name": "apps_meta",
+        "bytes": 7830551,
+        "backends": 0,
+        "xact_commit": 14374,
+        "xact_rollback": 0,
+        "blks_read": 126,
+        "blks_hit": 525989,
+        "tup_inserted": 0,
+        "tup_updated": 0,
+        "tup_deleted": 0
+      },
+      {
+        "name": "coulomb_social_db",
+        "bytes": 8952855,
+        "backends": 0,
+        "xact_commit": 14754,
+        "xact_rollback": 0,
+        "blks_read": 41,
+        "blks_hit": 574766,
+        "tup_inserted": 982,
+        "tup_updated": 77,
+        "tup_deleted": 11
+      },
+      {
+        "name": "postgres",
+        "bytes": 7830551,
+        "backends": 1,
+        "xact_commit": 146383,
+        "xact_rollback": 0,
+        "blks_read": 356,
+        "blks_hit": 3445068,
+        "tup_inserted": 0,
+        "tup_updated": 4,
+        "tup_deleted": 0
+      },
+      {
+        "name": "vergabe_db",
+        "bytes": 7668239,
+        "backends": 0,
+        "xact_commit": 0,
+        "xact_rollback": 0,
+        "blks_read": 0,
+        "blks_hit": 0,
+        "tup_inserted": 0,
+        "tup_updated": 0,
+        "tup_deleted": 0
+      }
+    ]
+  },
+  "consumers": [
+    {
+      "database": "coulomb_social_db",
+      "workload": "coulomb-social",
+      "role": "coulomb_social",
+      "cost_attribution_key": "platform:coulomb-social",
+      "bytes": 8952855,
+      "xact_commit": 14754,
+      "backends": 0,
+      "share_of_consumer_bytes": 0.5386
+    },
+    {
+      "database": "vergabe_db",
+      "workload": "vergabe-teilnahme",
+      "role": "vergabe",
+      "cost_attribution_key": "platform:vergabe-teilnahme",
+      "bytes": 7668239,
+      "xact_commit": 0,
+      "backends": 0,
+      "share_of_consumer_bytes": 0.4614
+    }
+  ],
+  "recovery": {
+    "cluster_ready": true,
+    "continuous_archiving": true,
+    "scheduled_backup_present": false,
+    "option_a_target": false,
+    "restore_drill_recorded": false,
+    "rpo": "unbounded",
+    "rto": "undefined",
+    "failure_domain": "single-host local-path on railiance01"
+  },
+  "allocation": {
+    "method": "proportional",
+    "driver": "database_gb",
+    "method_version": "apps-pg-dbbytes-v1",
+    "consumer_bytes": 16621094,
+    "residual_bytes": 586800924,
+    "residual_key": "platform:apps-pg-overhead",
+    "notes": [
+      "Consumer share is pg_database_size of declared consumer databases only.",
+      "Residual is PGDATA minus all non-template databases (WAL and catalogs)."
+    ]
+  },
+  "provenance": {
+    "commands": [
+      "kubectl get cluster apps-pg -n databases -o json",
+      "kubectl top pod -n databases -l cnpg.io/cluster=apps-pg",
+      "kubectl exec -n databases apps-pg-1 -c postgres -- du -sb /var/lib/postgresql/data/pgdata",
+      "psql non-secret catalog and pg_stat_database queries"
+    ],
+    "authority": "reef-railiance Kubernetes API + local postgres catalog"
+  }
+}