Add configuration files and compose setups for Grafana Alloy, Backrest, Loki, and Prometheus

alloy/compose.yml

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+# 
+
+# 
+
+name: alloy
+
+services:
+  alloy:
+    image: grafana/alloy:v1.9.2
+    container_name: alloy
+    command:
+      - run
+      - --server.http.listen-addr=0.0.0.0:12345
+      - --storage.path=/var/lib/alloy/data
+      - /etc/alloy/config.alloy
+    ports:
+      - "12345:12345"
+    volumes:
+      - ./config.alloy:/etc/alloy/config.alloy
+      - alloy_data:/var/lib/alloy/data
+      - /:/rootfs:ro
+      - /run:/run:ro
+      - /var/log:/var/log:ro
+      - /sys:/sys:ro
+      - /var/lib/docker/:/var/lib/docker/:ro
+      - /run/udev/data:/run/udev/data:ro
+    restart: unless-stopped
+    networks:
+      - proxy
+
+volumes:
+  alloy_data:
+    driver: local
+
+
+networks:
+  proxy:
+    external: true
+  

alloy/config.alloy

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+/* Grafana Alloy Configuration Examples
+ * ---
+ * LINK: For more details, visit https://github.com/grafana/alloy-scenarios
+*/
+
+// SECTION: TARGETS
+
+loki.write "default" {
+	endpoint {
+		url = "http://loki:3100/loki/api/v1/push"
+	}
+	external_labels = {}
+}
+
+prometheus.remote_write "default" {
+  endpoint {
+    url = "http://prometheus:9090/api/v1/write"
+  }
+}
+
+// !SECTION
+
+// SECTION: SYSTEM LOGS & 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]
+}
+
+// !SECTION
+
+// SECTION: SYSTEM 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"]
+  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]
+}
+
+// !SECTION
+
+// SECTION: DOCKER METRICS
+
+prometheus.exporter.cadvisor "dockermetrics" {
+  docker_host = "unix:///var/run/docker.sock"
+  storage_duration = "5m"
+}
+
+prometheus.scrape "dockermetrics" {
+  targets    = prometheus.exporter.cadvisor.dockermetrics.targets
+  forward_to = [ prometheus.remote_write.default.receiver ]
+  scrape_interval = "10s"
+}
+
+//!SECTION
+
+// SECTION: DOCKER 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]
+}
+
+// !SECTION