Refactor store dwell alert management API and dwell engine

- Updated argument parsing in manage_api.py to include new threshold parameters.
- Enhanced _config_payload to include thresholds and webhook configurations.
- Modified _build_summary to track queue metrics and adjust alert reporting.
- Refactored DwellEngine to utilize queue thresholds for alerting and reporting.
- Added queue metrics calculations and status change tracking in dwell_engine.py.
- Updated notifier.py to support posting JSON events to webhooks.
- Adjusted example configuration to reflect new threshold parameters.
- Enhanced Docker entrypoint script for better process management.
- Updated tests to cover new queue metrics and thresholds.
- Improved ManagedServiceDetail and ManagedServices Vue components to display queue metrics.

managed/store_dwell_alert/scripts/docker-entrypoint.sh

@@ -40,4 +40,67 @@ config_path.write_text(
 )
 PY
 
-exec python -m app.manage_api --config "${CONFIG_PATH}" --host "${API_HOST}" --port "${API_PORT}"
+exec python - "$CONFIG_PATH" "$API_HOST" "$API_PORT" <<'PY'
+import signal
+import subprocess
+import sys
+import time
+
+config_path, api_host, api_port = sys.argv[1:4]
+commands = [
+  [sys.executable, "-m", "app.main", "--config", config_path],
+  [
+    sys.executable,
+    "-m",
+    "app.manage_api",
+    "--config",
+    config_path,
+    "--host",
+    api_host,
+    "--port",
+    api_port,
+  ],
+]
+processes = [subprocess.Popen(command) for command in commands]
+
+
+def terminate_all(signum, _frame):
+  for process in processes:
+    if process.poll() is None:
+      process.terminate()
+  deadline = time.time() + 10
+  for process in processes:
+    if process.poll() is not None:
+      continue
+    timeout = max(0, deadline - time.time())
+    try:
+      process.wait(timeout=timeout)
+    except subprocess.TimeoutExpired:
+      process.kill()
+  raise SystemExit(128 + signum)
+
+
+for handled_signal in (signal.SIGINT, signal.SIGTERM):
+  signal.signal(handled_signal, terminate_all)
+
+while True:
+  for index, process in enumerate(processes):
+    return_code = process.poll()
+    if return_code is None:
+      continue
+    for other_index, other_process in enumerate(processes):
+      if other_index == index or other_process.poll() is not None:
+        continue
+      other_process.terminate()
+    deadline = time.time() + 10
+    for other_index, other_process in enumerate(processes):
+      if other_index == index or other_process.poll() is not None:
+        continue
+      timeout = max(0, deadline - time.time())
+      try:
+        other_process.wait(timeout=timeout)
+      except subprocess.TimeoutExpired:
+        other_process.kill()
+    raise SystemExit(return_code)
+  time.sleep(0.5)
+PY