Add Prometheus metrics and Winston logging to web application

[Copilot]

Implements Prometheus metrics exporter and Winston structured logging for the web app, matching the bot's existing observability infrastructure.

Changes

Metrics Infrastructure

• Created MetricsManager, MetricRegistry, and Prometheus exporter following bot's pattern
• Added /api/metrics endpoint exposing Prometheus-formatted metrics
• Metrics tracked: HTTP requests, API requests, database operations, application errors
• Includes default Node.js runtime metrics (heap, GC, event loop)

Logging Infrastructure

• Integrated Winston with configurable log levels (error/warn/info/verbose/debug)
• Forwarded Prisma client logs to Winston
• Added withMetricsAndLogging() wrapper for automatic API route instrumentation

Edge Runtime Compatibility

• Metrics/logging require Node.js runtime APIs
• API routes using observability explicitly declare export const runtime = 'nodejs'
• Middleware simplified to basic console logging (runs in Edge Runtime)

Usage

// API route with automatic logging and metrics
import { withMetricsAndLogging } from '@/app/lib/middleware/withMetricsAndLogging';
import { getLogger } from '@/app/lib/logging/logger';

const logger = getLogger('api/users');
export const runtime = 'nodejs';

async function handler(req: NextRequest) {
    logger.debug('Fetching users');
    const users = await client.user.findMany({ take: 10 });
    logger.info(`Retrieved ${users.length} users`);
    return NextResponse.json({ users });
}

export const GET = withMetricsAndLogging(handler, 'users');

Dependencies

Added: winston, winston-transport, prom-client

Documentation

See web/docs/METRICS_AND_LOGGING.md for complete usage guide and metric definitions.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• fonts.googleapis.com
  • Triggering command: /usr/local/bin/node node /home/REDACTED/work/Monorepo/Monorepo/node_modules/.bin/next build (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

For the webapp, please add a Prometheus exporter, similar to how it's implemented in the bot. Also, add tracking for common events (add a middleware or something to track events), and expose an endpoint at /metrics to get the formatted metrics. In addition, migrate all logging to use Winston, similar to the bot as well.

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