feat(docker): add Alloy configuration for log processing

Author: Ignorancio

docker-compose.yml

@@ -73,13 +73,13 @@ services:
       - grafana-storage:/var/lib/grafana
     networks:
       - spring-network
-  promtail:
-    image: grafana/promtail:latest
+  alloy:
+    image: grafana/alloy:latest
     restart: unless-stopped
     volumes:
       - ./logs:/var/log/app
-      - ./docker-config/promtail/promtail-config.yml:/etc/promtail/config.yml
-    command: -config.file=/etc/promtail/config.yml
+      - ./docker-config/alloy/config.alloy:/etc/alloy/config.alloy
+    command: run /etc/alloy/config.alloy
     depends_on:
       - loki
     networks:

docker-config/alloy/config.alloy

@@ -0,0 +1,18 @@
+local.file_match "springboot_logs" {
+  path_targets = [{
+    "__path__"  = "/var/log/app/*.log",
+    "job"       = "springboot",
+    "hostname"  = constants.hostname,
+  }]
+}
+
+loki.source.file "springboot_logs" {
+  targets = local.file_match.springboot_logs.targets
+  forward_to = [loki.write.main.receiver]
+}
+
+loki.write "main" {
+  endpoint {
+    url = "http://loki:3100/loki/api/v1/push"
+  }
+}