ChristianLempa_Boilerplates/library/compose/alloy/config/config.alloy.j2

/* Grafana Alloy Configuration
 * ---
 * Generated by boilerplates CLI
 * 
 * This configuration file is dynamically generated based on your selected
 * log and metrics collection options.
 *
 * For more details, visit https://github.com/grafana/alloy-scenarios
 */

// Disable internal traces that are trying to export to Tempo by default
otelcol.exporter.otlp "tempo" {
  client {
    endpoint = "localhost:4317"
    tls {
      insecure = true
    }
  }
}

{% if logs_enabled or metrics_enabled %}
// ============================================================================
// REMOTE ENDPOINTS
// ============================================================================

{% if logs_enabled %}
/* Loki Write Endpoint */
loki.write "default" {
  endpoint {
    url = "{{ logs_loki_url }}"
    
    // Batching configuration to reduce request volume and prevent rate limiting
    batch_wait = "5s"           // Wait up to 5 seconds before sending
    batch_size = "1MiB"         // Send when batch reaches 1MB (1048576 bytes)
  }
  external_labels = {}
}
{% endif %}

{% if metrics_enabled %}
/* Prometheus Remote Write Endpoint */
prometheus.remote_write "default" {
  endpoint {
    url = "{{ metrics_prometheus_url }}"
  }
}
{% endif %}

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

{% if logs_docker %}
/* Docker Container Logs */
discovery.docker "dockerlogs" {
  host = "unix:///var/run/docker.sock"
}

discovery.relabel "dockerlogs" {
  targets = []

  rule {
    source_labels = ["__meta_docker_container_name"]
    regex = "/(.*)"
    target_label = "service_name"
  }
}

loki.source.docker "default" {
  host       = "unix:///var/run/docker.sock"
  targets    = discovery.docker.dockerlogs.targets
  labels     = {"platform" = "docker"}
  relabel_rules = discovery.relabel.dockerlogs.rules
  forward_to = [loki.write.default.receiver]
}
{% endif %}

{% if logs_system %}
/* System Logs & Journal */
loki.source.journal "journal" {
  max_age       = "24h0m0s"
  relabel_rules = discovery.relabel.journal.rules
  forward_to    = [loki.write.default.receiver]
  labels        = {component = string.format("%s-journal", constants.hostname)}
  // NOTE: This is important to fix https://github.com/grafana/alloy/issues/924
  path          = "/var/log/journal"
}

local.file_match "system" {
  path_targets = [{
    __address__ = "localhost",
    __path__    = "/var/log/{syslog,messages,*.log}",
    instance    = constants.hostname,
    job         = string.format("%s-logs", constants.hostname),
  }]
}

discovery.relabel "journal" {
  targets = []
  rule {
    source_labels = ["__journal__systemd_unit"]
    target_label  = "unit"
  }
  rule {
    source_labels = ["__journal__boot_id"]
    target_label  = "boot_id"
  }
  rule {
    source_labels = ["__journal__transport"]
    target_label  = "transport"
  }
  rule {
    source_labels = ["__journal_priority_keyword"]
    target_label  = "level"
  }
}

loki.source.file "system" {
  targets    = local.file_match.system.targets
  forward_to = [loki.write.default.receiver]
}
{% endif %}
{% endif %}

{% if metrics_enabled %}
// ============================================================================
// METRICS COLLECTION
// ============================================================================

{% if metrics_docker %}
/* Docker Container Metrics (cAdvisor) */
prometheus.exporter.cadvisor "dockermetrics" {
  docker_host = "unix:///var/run/docker.sock"
  storage_duration = "5m"
}

/* Relabel component to drop container_spec metrics that often have NaN values */
prometheus.relabel "docker_filter" {
  forward_to = [prometheus.remote_write.default.receiver]
  
  rule {
    source_labels = ["__name__"]
    regex = "container_spec_(cpu_period|cpu_quota|cpu_shares|memory_limit_bytes|memory_swap_limit_bytes|memory_reservation_limit_bytes)"
    action = "drop"
  }
}

prometheus.scrape "dockermetrics" {
  targets    = prometheus.exporter.cadvisor.dockermetrics.targets
  forward_to = [prometheus.relabel.docker_filter.receiver]
  scrape_interval = "10s"
}
{% endif %}

{% if metrics_system %}
/* System (Node) Metrics */
discovery.relabel "metrics" {
  targets = prometheus.exporter.unix.metrics.targets
  rule {
    target_label = "instance"
    replacement  = constants.hostname
  }
  rule {
    target_label = "job"
    replacement = string.format("%s-metrics", constants.hostname)
  }
}

prometheus.exporter.unix "metrics" {
  disable_collectors = ["ipvs", "btrfs", "infiniband", "xfs", "zfs"]
  enable_collectors = ["meminfo"]
  rootfs_path = "/rootfs"
  filesystem {
    fs_types_exclude     = "^(autofs|binfmt_misc|bpf|cgroup2?|configfs|debugfs|devpts|devtmpfs|tmpfs|fusectl|hugetlbfs|iso9660|mqueue|nsfs|overlay|proc|procfs|pstore|rpc_pipefs|securityfs|selinuxfs|squashfs|sysfs|tracefs)$"
    mount_points_exclude = "^/(dev|proc|run/credentials/.+|sys|var/lib/docker/.+)($|/)"
    mount_timeout        = "5s"
  }
  netclass {
    ignored_devices = "^(veth.*|cali.*|[a-f0-9]{15})$"
  }
  netdev {
    device_exclude = "^(veth.*|cali.*|[a-f0-9]{15})$"
  }
}

prometheus.scrape "metrics" {
  scrape_interval = "15s"
  targets    = discovery.relabel.metrics.output
  forward_to = [prometheus.remote_write.default.receiver]
}
{% endif %}
{% endif %}

{% else %}
// ============================================================================
// NO COLLECTION ENABLED
// ============================================================================
// 
// No log or metrics collection is currently enabled.
// To enable collection, set logs_enabled or metrics_enabled to true when
// generating this template.
//
// For more information, visit: https://grafana.com/docs/alloy/latest/
{% endif %}