blumeops/ansible/roles/alloy/templates/config.alloy.j2

// {{ ansible_managed }}
// Grafana Alloy configuration for {{ alloy_instance_label }}
// Collects system metrics (replacing node_exporter) and logs

// ============== METRICS COLLECTION ==============

// System metrics exporter (replaces node_exporter)
prometheus.exporter.unix "system" {
  // Disable collectors that don't work on macOS
  disable_collectors = ["thermal"]

  textfile {
    directory = "{{ alloy_textfile_dir }}"
  }
}

// Scrape system metrics
prometheus.scrape "system" {
  targets         = prometheus.exporter.unix.system.targets
  forward_to      = [prometheus.relabel.instance.receiver]
  scrape_interval = "{{ alloy_scrape_interval }}"
}

// Add instance label to match existing setup
prometheus.relabel "instance" {
  forward_to = [prometheus.remote_write.prometheus.receiver]

  rule {
    target_label = "instance"
    replacement  = "{{ alloy_instance_label }}"
  }
}

// Push metrics to Prometheus via remote_write
prometheus.remote_write "prometheus" {
  endpoint {
    url = "{{ alloy_prometheus_url }}"
  }
}

{% if alloy_collect_postgres | default(false) %}
// ============== POSTGRESQL METRICS ==============

// PostgreSQL exporter (read-only metrics via pg_monitor role)
prometheus.exporter.postgres "postgresql" {
  data_source_names = ["postgresql://{{ alloy_postgres_user }}:{{ alloy_postgres_password | urlencode }}@{{ alloy_postgres_host }}:{{ alloy_postgres_port }}/{{ alloy_postgres_database }}?sslmode=disable"]

  // Custom queries for vacuum and XID monitoring
  custom_queries_config_path = "{{ alloy_config_dir }}/postgres_queries.yaml"
}

// Scrape PostgreSQL metrics
prometheus.scrape "postgresql" {
  targets         = prometheus.exporter.postgres.postgresql.targets
  forward_to      = [prometheus.relabel.instance.receiver]
  scrape_interval = "{{ alloy_scrape_interval }}"
}
{% endif %}

{% if alloy_collect_zot | default(false) %}
// ============== ZOT REGISTRY METRICS ==============

// Scrape Zot's native metrics endpoint
prometheus.scrape "zot" {
  targets         = [{"__address__" = "localhost:5050"}]
  metrics_path    = "/metrics"
  forward_to      = [prometheus.relabel.instance.receiver]
  scrape_interval = "{{ alloy_scrape_interval }}"
}
{% endif %}

{% if alloy_collect_logs %}
// ============== LOG COLLECTION ==============

// Discover log files - brew services
local.file_match "brew_logs" {
  path_targets = [
{% for log in alloy_brew_logs %}
    {__path__ = "{{ log.path }}", service = "{{ log.service }}", stream = "{{ log.stream }}"},
{% endfor %}
  ]
}

// Discover log files - mcquack LaunchAgents
local.file_match "mcquack_logs" {
  path_targets = [
{% for log in alloy_mcquack_logs %}
    {__path__ = "{{ log.path }}", service = "{{ log.service }}", stream = "{{ log.stream }}"},
{% endfor %}
  ]
}

// Discover log files - Plex Media Server
local.file_match "plex_logs" {
  path_targets = [
{% for log in alloy_plex_logs %}
    {__path__ = "{{ log.path }}", service = "{{ log.service }}", stream = "{{ log.stream }}"},
{% endfor %}
  ]
}

// Read and forward brew service logs
loki.source.file "brew_logs" {
  targets    = local.file_match.brew_logs.targets
  forward_to = [loki.relabel.add_host.receiver]
}

// Read and forward mcquack service logs
loki.source.file "mcquack_logs" {
  targets    = local.file_match.mcquack_logs.targets
  forward_to = [loki.relabel.add_host.receiver]
}

// Read and forward Plex logs
loki.source.file "plex_logs" {
  targets    = local.file_match.plex_logs.targets
  forward_to = [loki.relabel.add_host.receiver]
}

// Add host label to all logs
loki.relabel "add_host" {
  forward_to = [loki.write.loki.receiver]

  rule {
    target_label = "host"
    replacement  = "{{ alloy_instance_label }}"
  }
}

// Write logs to Loki
loki.write "loki" {
  endpoint {
    url = "{{ alloy_loki_url }}"
  }
}
{% endif %}