feat(monitoring): setup alloy

monitoring/.env.sample

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+GCLOUD_RW_API_KEY="XYZ"
+
+MAPSWIPE_ENV=mapswipe-test
+# Fleep management
+GCLOUD_FM_ID=mapswipe-test
+GCLOUD_FM_URL="https://fleet-management-xyz.grafana.net"
+GCLOUD_FM_HOSTED_ID="NUMBER"
+GCLOUD_FM_POLL_FREQUENCY="60s"
+
+# Loki
+GCLOUD_HOSTED_LOGS_URL="https://logs-xyz.grafana.net/loki/api/v1/push"
+GCLOUD_HOSTED_LOGS_ID="NUMBER"
+
+# Prometheus
+GCLOUD_HOSTED_METRICS_URL="https://prometheus-xyz.grafana.net/api/prom/push"
+GCLOUD_HOSTED_METRICS_ID="NUMBER"

monitoring/config.alloy

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+logging {
+    level  = "info"
+    format = "logfmt"
+}
+
+locals {
+    scrape_interval = "30s"
+
+    gc_prom_url = sys.env("GCLOUD_HOSTED_METRICS_URL")
+    gc_prom_id  = sys.env("GCLOUD_HOSTED_METRICS_ID")
+
+    gc_loki_url = sys.env("GCLOUD_HOSTED_LOGS_URL")
+    gc_loki_id  = sys.env("GCLOUD_HOSTED_LOGS_ID")
+
+    gc_api_key = sys.env("GCLOUD_RW_API_KEY")
+
+    hostname = env("HOSTNAME")
+
+    host_root = "/host/root"
+}
+
+// locals {
+//   scrape_interval = "15s"
+//   gc_prom_url     = "https://prometheus-prod-XX.grafana.net/api/prom/push"
+//   gc_loki_url     = "https://logs-prod-XX.grafana.net/loki/api/v1/push"
+//   gc_username     = "<YOUR_GRAFANA_CLOUD_USERNAME>"
+//   gc_api_key      = "<YOUR_GRAFANA_CLOUD_API_KEY>"
+//   host_root       = "/host/root"
+//   hostname        = env("HOSTNAME")
+// }
+
+// remotecfg {
+//     id             = sys.env("GCLOUD_FM_ID")
+//     url            = sys.env("GCLOUD_FM_URL")
+//     poll_frequency = sys.env("GCLOUD_FM_POLL_FREQUENCY")
+// 
+//     basic_auth {
+//         username = sys.env("GCLOUD_FM_HOSTED_ID")
+//         password = local.gc_api_key
+//     }
+// }
+
+otelcol.processor.resource "add_instance_label" {
+  attributes {
+    key    = "instance"
+    value  = local.hostname
+    action = "insert"
+  }
+}
+
+otelcol.receiver.hostmetrics "default" {
+  collection_interval = local.scrape_interval
+
+  scrapers = {
+    cpu      = {}
+    disk     = {
+      mount_point = local.host_root
+    }
+    filesystem = {
+      mount_point = local.host_root
+    }
+    load     = {}
+    memory   = {}
+    network  = {}
+    paging   = {}
+    uptime   = {}
+    processes = {}
+  }
+
+  root_path = local.host_root
+}
+
+otelcol.receiver.docker_stats "default" {
+  endpoint = "unix:///var/run/docker.sock"
+  collection_interval = local.scrape_interval
+}
+
+loki.source.docker "default" {
+  docker_host = "unix:///var/run/docker.sock"
+  labels = {
+    job       = "docker-logs"
+    instance  = local.hostname
+  }
+}
+
+otelcol.processor.batch "default" {}
+
+otelcol.exporter.prometheusremotewrite "grafana_cloud" {
+  endpoint = local.gc_prom_url
+  headers = {
+    "Authorization" = "Basic ${base64(local.gc_username + ":" + local.gc_api_key)}"
+  }
+}
+
+loki.exporter "grafana_cloud" {
+  endpoint = local.gc_loki_url
+  labels = {
+    job      = "container-logs"
+    hostname = local.hostname
+  }
+  tenant_id = local.gc_username
+  basic_auth {
+    username = local.gc_username
+    password = local.gc_api_key
+  }
+}
+
+otelcol.service "metrics" {
+  pipelines = {
+    metrics = {
+      receivers  = [
+        otelcol.receiver.hostmetrics.default,
+        otelcol.receiver.docker_stats.default,
+      ]
+      processors = [otelcol.processor.batch.default]
+      exporters  = [otelcol.exporter.prometheusremotewrite.grafana_cloud]
+    }
+  }
+}
+
+loki.service "logs" {
+  sources   = [loki.source.docker.default]
+  exporters = [loki.exporter.grafana_cloud]
+}

monitoring/docker-compose.yaml

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+services:
+  alloy:
+    image: grafana/alloy:latest
+    container_name: grafana_alloy
+    restart: unless-stopped
+    ports:
+      - '127.0.0.1:12345:12345'
+    command:
+      - run
+      - --server.http.listen-addr=0.0.0.0:12345
+      - --storage.path=/var/lib/alloy/data
+      - /etc/alloy/config.alloy
+    env_file:
+      - .env
+    volumes:
+      # mount config file
+      - './config.alloy:/etc/alloy/config.alloy'
+      # give access to running docker containers for discovery.docker
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+      # give access to docker's log files directory (optional)
+      - /var/lib/docker/containers:/var/lib/docker/containers:ro
+      # Host
+      - /proc:/host/proc:ro
+      - /sys:/host/sys:ro
+      - /:/host/root:ro
+      - /var/log:/host/var/log:ro