Add prometheus exporter for provider metrics

src/modules/metrics/index.ts

@@ -9,6 +9,15 @@ const log = scopedLogger('metrics');
 
 export type Metrics = {
   user: Counter<'namespace'>;
+  providerMetrics: Counter<
+    | 'title'
+    | 'tmdb_id'
+    | 'season_id'
+    | 'episode_id'
+    | 'status'
+    | 'type'
+    | 'provider_id'
+  >;
 };
 
 let metrics: null | Metrics = null;
@@ -29,8 +38,26 @@ export async function setupMetrics(app: FastifyInstance) {
       help: 'user_help',
       labelNames: ['namespace'],
     }),
+    providerMetrics: new Counter({
+      name: 'provider_metrics',
+      help: 'provider_metrics',
+      labelNames: [
+        'episode_id',
+        'provider_id',
+        'season_id',
+        'status',
+        'title',
+        'tmdb_id',
+        'type',
+      ],
+    }),
   };
 
+  const promClient = app.metrics.client;
+
+  promClient.register.registerMetric(metrics.user);
+  promClient.register.registerMetric(metrics.providerMetrics);
+
   const orm = getORM();
   const em = orm.em.fork();
   log.info(`Syncing up metrics...`, { evt: 'sync' });

src/routes/metrics.ts

@@ -2,6 +2,7 @@ import { handle } from '@/services/handler';
 import { makeRouter } from '@/services/router';
 import { z } from 'zod';
 import { ProviderMetric, status } from '@/db/models/ProviderMetrics';
+import { getMetrics } from '@/modules/metrics';
 
 const metricsProviderSchema = z.object({
   tmdbId: z.string(),
@@ -45,6 +46,19 @@ export const metricsRouter = makeRouter((app) => {
         });
         return metric;
       });
+
+      entities.forEach((entity) => {
+        getMetrics().providerMetrics.inc({
+          episode_id: entity.episodeId,
+          provider_id: entity.providerId,
+          season_id: entity.seasonId,
+          status: entity.status,
+          title: entity.title,
+          tmdb_id: entity.tmdbId,
+          type: entity.type,
+        });
+      });
+
       await em.persistAndFlush(entities);
       return true;
     }),