fix: add health_check method to PrometheusClient

app/core/prometheus_client.py

@@ -251,6 +251,53 @@ class PrometheusClient:
             "data_source": "prometheus"
         }
     
+    def health_check(self) -> Dict[str, Any]:
+        """
+        Check Prometheus connectivity and health.
+        
+        Returns:
+            Health status
+        """
+        try:
+            if not self.initialized or not self.session:
+                return {
+                    'status': 'unhealthy',
+                    'prometheus_url': self.prometheus_url,
+                    'error': 'Prometheus not initialized'
+                }
+            
+            # Use aiohttp session for health check
+            import asyncio
+            loop = asyncio.new_event_loop()
+            asyncio.set_event_loop(loop)
+            
+            async def _health_check():
+                async with self.session.get(f"{self.prometheus_url}/api/v1/status/config") as response:
+                    if response.status == 200:
+                        return {
+                            'status': 'healthy',
+                            'prometheus_url': self.prometheus_url,
+                            'response_time': 0.1  # Placeholder
+                        }
+                    else:
+                        return {
+                            'status': 'unhealthy',
+                            'prometheus_url': self.prometheus_url,
+                            'error': f'HTTP {response.status}'
+                        }
+            
+            result = loop.run_until_complete(_health_check())
+            loop.close()
+            return result
+            
+        except Exception as e:
+            logger.error(f"Prometheus health check failed: {e}")
+            return {
+                'status': 'unhealthy',
+                'prometheus_url': self.prometheus_url,
+                'error': str(e)
+            }
+    
     async def close(self):
         """Close HTTP session"""
         if self.session: