# Scalability, Observability, and Operations Overview

## What this section covers

This section documents horizontal scaling, load balancing, load-test methodology, and production-style monitoring/alerting.

Implemented artifacts in repository:

* Multi-instance app deployment through Docker Compose
* NGINX reverse proxy and load balancing
* Redis-backed caching layer
* K6 load testing scripts for bronze and silver intensity
* Prometheus scraping and alert rules
* Alertmanager routing for critical and warning alerts
* Grafana dashboards for runtime trends

## Key files

* `compose.yaml`
* `nginx/nginx.conf`
* `loadtest_bronze.js`
* `loadtest_silver.js`
* `monitoring/prometheus/prometheus.yml`
* `monitoring/prometheus/alert_rules.yml`
* `monitoring/alertmanager/alertmanager.yml`
* `monitoring/grafana/provisioning/`
* `monitoring/grafana/dashboards/`

## Section outcomes

* Increased throughput capacity using more than one app instance
* Stable endpoint behavior under synthetic mixed workload
* Monitoring stack for service health, latency, and error-rate alerts

## Related pages

* `load-testing.md`
* `monitoring-and-alerting.md`
* `operations-playbook.md`
* `diagrams.md`