Turn on Traefik access logs

This will be useful for debugging issues and gathering statistics.

Use the JSON format, since that allows us to include more information than
the traditional HTTP access logs. Switch the other logs to JSON as well, for
ease of parsing.

changelog.d/20231107_183551_roman_traefik_logs.md

@@ -0,0 +1,5 @@
+### Changed
+
+- The Docker Compose file and Helm chart now enable Traefik access logs by
+  default, and change the log format to JSON
+  (<https://github.com/opencv/cvat/pull/7109>)

docker-compose.yml

@@ -224,6 +224,22 @@ services:
     container_name: traefik
     restart: always
     command:
+      - '--log.format=json'
+
+      - '--accesslog.format=json'
+      - '--accesslog.fields.defaultmode=drop'
+      - '--accesslog.fields.names.ClientHost=keep'
+      - '--accesslog.fields.names.DownstreamContentSize=keep'
+      - '--accesslog.fields.names.DownstreamStatus=keep'
+      - '--accesslog.fields.names.Duration=keep'
+      - '--accesslog.fields.names.RequestAddr=keep'
+      - '--accesslog.fields.names.RequestMethod=keep'
+      - '--accesslog.fields.names.RequestPath=keep'
+      - '--accesslog.fields.names.RequestProtocol=keep'
+      - '--accesslog.fields.names.RequestProtocol=keep'
+      - '--accesslog.fields.names.RouterName=keep'
+      - '--accesslog.fields.names.StartUTC=keep'
+
       - '--providers.docker.exposedByDefault=false'
       - '--providers.docker.network=cvat'
       - '--entryPoints.web.address=:8080'

helm-chart/values.yaml

@@ -413,6 +413,27 @@ traefik:
   service:
     externalIPs:
       # - "192.168.49.2"
+  logs:
+    general:
+      format: json
+    access:
+      enabled: true
+      format: json
+      fields:
+        general:
+          defaultmode: drop
+          names:
+            ClientHost: keep
+            DownstreamContentSize: keep
+            DownstreamStatus: keep
+            Duration: keep
+            RequestAddr: keep
+            RequestMethod: keep
+            RequestPath: keep
+            RequestProtocol: keep
+            RequestProtocol: keep
+            RouterName: keep
+            StartUTC: keep
 
 smokescreen:
   opts: ''