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src/metrics/metrics.module.ts

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+import { Module } from '@nestjs/common';
+import {
+  PrometheusModule,
+  makeCounterProvider,
+  makeGaugeProvider,
+} from '@willsoto/nestjs-prometheus';
+import { MetricsService } from './metrics.service';
+
+@Module({
+  imports: [
+    PrometheusModule.register({
+      path: '/metrics',
+      defaultMetrics: { enabled: true },
+    }),
+  ],
+  providers: [
+    MetricsService,
+    makeCounterProvider({
+      name: 'sso_logins_total',
+      help: 'Total number of successful logins',
+    }),
+    makeCounterProvider({
+      name: 'sso_logins_failed_total',
+      help: 'Total number of failed login attempts',
+    }),
+    makeGaugeProvider({
+      name: 'sso_active_sessions',
+      help: 'Number of active sessions',
+    }),
+  ],
+  exports: [MetricsService],
+})
+export class MetricsModule {}