chore(server): switch to prometheus (#12352)

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->

## Summary by CodeRabbit

- **New Features**
  - Added platform-specific monitoring integration for Google Cloud Platform (GCP) in multiple services, enabling automated pod monitoring for deployments on GCP.

- **Chores**
  - Removed an unused dependency related to Google Cloud monitoring from the backend server package.

- **Refactor**
  - Updated internal monitoring implementation by removing a previously used metric reader method for GCP integration.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/package.json

@@ -36,7 +36,6 @@
     "@aws-sdk/client-s3": "^3.779.0",
     "@aws-sdk/s3-request-presigner": "^3.779.0",
     "@fal-ai/serverless-client": "^0.15.0",
-    "@google-cloud/opentelemetry-cloud-monitoring-exporter": "^0.20.0",
     "@google-cloud/opentelemetry-cloud-trace-exporter": "^2.4.1",
     "@google-cloud/opentelemetry-resource-util": "^2.4.0",
     "@nestjs-cls/transactional": "^2.6.1",

packages/backend/server/src/plugins/gcloud/metrics.ts

@@ -1,13 +1,8 @@
-import { MetricExporter } from '@google-cloud/opentelemetry-cloud-monitoring-exporter';
 import { TraceExporter } from '@google-cloud/opentelemetry-cloud-trace-exporter';
 import { GcpDetectorSync } from '@google-cloud/opentelemetry-resource-util';
 import { Global, Injectable, Module, Provider } from '@nestjs/common';
 import { getEnv } from '@opentelemetry/core';
 import { Resource } from '@opentelemetry/resources';
-import {
-  MetricReader,
-  PeriodicExportingMetricReader,
-} from '@opentelemetry/sdk-metrics';
 import { SpanExporter } from '@opentelemetry/sdk-trace-node';
 import {
   SEMRESATTRS_CONTAINER_NAME,
@@ -31,17 +26,6 @@ export class GCloudOpentelemetryOptionsFactory extends OpentelemetryOptionsFacto
       .merge(new GcpDetectorSync().detect());
   }
 
-  override getMetricReader(): MetricReader {
-    return new PeriodicExportingMetricReader({
-      exportIntervalMillis: 30000,
-      exportTimeoutMillis: 10000,
-      exporter: new MetricExporter({
-        prefix: 'custom.googleapis.com',
-      }),
-      metricProducers: this.getMetricsProducers(),
-    });
-  }
-
   override getSpanExporter(): SpanExporter {
     return new TraceExporter();
   }