Feat/83 grafana alerts and rules

[luaraggio]

• Implementar alertas e regras, fiz tanto no prometheus quanto um container de alertmanager

• Internamente está tudo funcionando, mas pelo fato de eu ter adicionado proxy no nginx pro prometheus e mexido na url do prometheus, prometheus não está mais conseguindo se monitorar

• Ao tentar retirar a parte de proxy do prometheus, outros exporters (métricas) ficam esquisitos

Obs: podemos otimizar amanhã, por enquanto funciona internamente.. vc consegue observar funcionando em localhost/prometheus/ e entrar na parte de alertas/rules

[Copilot]

Pull request overview

Adds Prometheus alerting rules and an Alertmanager container to support alert evaluation and routing in the existing Grafana/Prometheus monitoring stack.

Changes:

• Configures Prometheus to load rule files and send alerts to Alertmanager.
• Introduces an initial set of Prometheus alert rules (availability, host resources, containers).
• Adds Alertmanager service + persistent volume to docker-compose.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
infra/prometheus/config/prometheus.yml	Enables rule loading and Alertmanager integration in Prometheus config
infra/prometheus/config/alerts.yml	Adds initial alert rule groups (availability/resources/containers)
infra/docker/docker-compose.yml	Mounts Prometheus config directory and adds Alertmanager service + volume
infra/alertmanager/config/alertmanager.yml	Adds baseline Alertmanager routing/receivers configuration

Comments suppressed due to low confidence (1)

infra/prometheus/config/prometheus.yml:20

• With --web.route-prefix=/prometheus (see docker-compose), Prometheus serves its own metrics at /prometheus/metrics, but this scrape job uses the default /metrics path. That makes the self-scrape return 404 and up{job="prometheus"} go to 0. Set metrics_path: /prometheus/metrics for this job (or drop the route-prefix/external-url approach).

scrape_configs:
  - job_name: 'prometheus'
    static_configs:
      - targets: ['prometheus:9090']

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