feat(observability): add Prometheus/Grafana/Loki/Alertmanager/Alloy stack and remove legacy Monitoring UI

2026-06-16 11:08:32 +00:00
parent 615e02e970
commit e2ad731b5f
80 changed files with 5020 additions and 3665 deletions
@@ -0,0 +1,109 @@
+"""Tests for Prometheus file-based service discovery target generation."""
+
+from pathlib import Path
+
+import pytest
+
+from media_library_viewer_api.services.settings_store import SettingsStore
+from media_library_viewer_api.services.targets import (
+    build_node_exporter_targets,
+    write_prometheus_targets,
+)
+
+
+@pytest.fixture
+def store(tmp_path: Path) -> SettingsStore:
+    db = SettingsStore(tmp_path / "settings.sqlite")
+    db.init_schema()
+    return db
+
+
+class TestBuildNodeExporterTargets:
+    def test_disabled_machine_excluded(self, store: SettingsStore):
+        store.upsert_machine(
+            {
+                "name": "remote1",
+                "mode": "ssh",
+                "host": "10.0.0.5",
+                "username": "u",
+                "node_exporter_enabled": False,
+                "node_exporter_port": 9200,
+            }
+        )
+        assert build_node_exporter_targets(store) == []
+
+    def test_ssh_enabled_machine_included(self, store: SettingsStore):
+        machine = store.upsert_machine(
+            {
+                "name": "remote1",
+                "mode": "ssh",
+                "host": "10.0.0.5",
+                "username": "u",
+                "node_exporter_enabled": True,
+                "node_exporter_port": 9200,
+                "node_exporter_scrape_host": "1.2.3.4",
+            }
+        )
+        targets = build_node_exporter_targets(store)
+        assert len(targets) == 1
+        assert targets[0]["targets"] == ["1.2.3.4:9200"]
+        assert targets[0]["labels"]["machine_id"] == machine["id"]
+        assert targets[0]["labels"]["machine_name"] == "remote1"
+        assert targets[0]["labels"]["job"] == "node-exporter-remote"
+
+    def test_scrape_host_defaults_to_machine_host(self, store: SettingsStore):
+        store.upsert_machine(
+            {
+                "name": "remote2",
+                "mode": "ssh",
+                "host": "remote2.example.com",
+                "username": "u",
+                "node_exporter_enabled": True,
+                "node_exporter_port": 9100,
+            }
+        )
+        targets = build_node_exporter_targets(store)
+        assert targets[0]["targets"] == ["remote2.example.com:9100"]
+
+    def test_local_machine_excluded(self, store: SettingsStore):
+        store.upsert_machine(
+            {
+                "name": "This machine",
+                "mode": "local",
+                "host": "localhost",
+                "username": "",
+                "node_exporter_enabled": True,
+            }
+        )
+        assert build_node_exporter_targets(store) == []
+
+    def test_missing_host_excluded(self, store: SettingsStore):
+        store.upsert_machine(
+            {
+                "name": "remote3",
+                "mode": "ssh",
+                "host": "",
+                "username": "u",
+                "node_exporter_enabled": True,
+            }
+        )
+        assert build_node_exporter_targets(store) == []
+
+
+class TestWritePrometheusTargets:
+    def test_writes_valid_json(self, store: SettingsStore, tmp_path: Path):
+        store.upsert_machine(
+            {
+                "name": "remote1",
+                "mode": "ssh",
+                "host": "10.0.0.5",
+                "username": "u",
+                "node_exporter_enabled": True,
+                "node_exporter_port": 9200,
+            }
+        )
+        file_path = write_prometheus_targets(store, tmp_path)
+        assert file_path.exists()
+        assert file_path.name == "node_exporter_targets.json"
+        targets = build_node_exporter_targets(store)
+        assert len(targets) == 1