feat(traefik): Add support for JSON format logs (#2609)

* Add support for JSON format Traefik logs

* Update log formats to use enums

And improve documentation

charts/core/traefik/Chart.yaml

@@ -22,7 +22,7 @@ sources:
 - https://github.com/traefik/traefik-helm-chart
 - https://traefik.io/
 type: application
-version: 11.2.2
+version: 11.3.0
 annotations:
   truecharts.org/catagories: |
     - network

charts/core/traefik/questions.yaml

@@ -154,6 +154,16 @@ questions:
                       description: "Panics"
                     - value: "DEBUG"
                       description: "Debug"
+              - variable: format
+                label: "General Log format"
+                schema:
+                  type: string
+                  default: "common"
+                  enum:
+                    - value: "common"
+                      description: "Common Log Format"
+                    - value: "json"
+                      description: "JSON"
         - variable: access
           label: "Access Logs"
           schema:
@@ -233,7 +243,16 @@ questions:
                                         description: "Keep"
                                       - value: "drop"
                                         description: "Drop"
-
+                    - variable: format
+                      label: "Access Log format"
+                      schema:
+                        type: string
+                        default: "common"
+                        enum:
+                          - value: "common"
+                            description: "Common Log Format"
+                          - value: "json"
+                            description: "JSON"
   - variable: middlewares
     label: ""
     group: "Middlewares"

charts/core/traefik/templates/_args.tpl

@@ -107,17 +107,13 @@ args:
   {{- end }}
   {{- end }}
   {{- with .Values.logs }}
-  {{- if .general.format }}
   - "--log.format={{ .general.format }}"
-  {{- end }}
   {{- if ne .general.level "ERROR" }}
   - "--log.level={{ .general.level | upper }}"
   {{- end }}
   {{- if .access.enabled }}
   - "--accesslog=true"
-  {{- if .access.format }}
   - "--accesslog.format={{ .access.format }}"
-  {{- end }}
   {{- if .access.bufferingsize }}
   - "--accesslog.bufferingsize={{ .access.bufferingsize }}"
   {{- end }}

charts/core/traefik/values.yaml

@@ -57,18 +57,13 @@ providers:
 logs:
   # Traefik logs concern everything that happens to Traefik itself (startup, configuration, events, shutdown, and so on).
   general:
-    # By default, the logs use a text format (common), but you can
-    # also ask for the json format in the format option
-    # format: json
     # By default, the level is set to ERROR. Alternative logging levels are DEBUG, PANIC, FATAL, ERROR, WARN, and INFO.
     level: ERROR
+    # -- Set the format of General Logs to be either Common Log Format or JSON. For more information: https://doc.traefik.io/traefik/observability/logs/#format
+    format: common
   access:
     # To enable access logs
     enabled: false
-    # By default, logs are written using the Common Log Format (CLF).
-    # To write logs in JSON, use json in the format option.
-    # If the given format is unsupported, the default (CLF) is used instead.
-    # format: json
     # To write the logs in an asynchronous fashion, specify a bufferingSize option.
     # This option represents the number of log lines Traefik will keep in memory before writing
     # them to the selected output. In some cases, this option can greatly help performances.
@@ -93,6 +88,8 @@ logs:
           # User-Agent: redact
           # Authorization: drop
           # Content-Type: keep
+    # -- Set the format of Access Logs to be either Common Log Format or JSON. For more information: https://doc.traefik.io/traefik/observability/access-logs/#format
+    format: common
 
 metrics:
   # datadog: