feat: /metrics

src/lib/webserver.ts

@@ -18,6 +18,23 @@ export function webappServe(watchers: Watcher[], host = 'localhost', port = 1050
     }))
   })
 
+  webapp.get('/metrics', (req, res) => {
+    res.set('Content-Type', 'text/plain; version=0.0.4')
+    
+    const metrics: string[] = []
+    
+    watchers.forEach(watcher => {
+      const name = watcher.name.replace(/[^a-zA-Z0-9_]/g, '_')
+      const state = watcher.state
+
+      // Métrique d'état numérique (0=INIT, 1=OK, 2=FAILURE, 3=RECOVERED)
+      const stateValue = state === 'INIT' ? 0 : state === 'OK' ? 1 : state === 'FAILURE' ? 2 : 3
+      metrics.push(`dwatcher_watcher_state{name="${name}",state="${state}"} ${stateValue}`)
+    })
+    
+    res.send(metrics.join('\n') + '\n')
+  })
+
   webapp.use('/', express.static(path.join(__dirname, '../../dist/')))
 
   webapp.listen(port, host, () => console.log(`webserver listening at http://${host}:${port}`))