Add resourceAttributes option to OTel metrics

Co-authored-by: Romain <rtribotte@users.noreply.github.com>

docs/content/reference/static-configuration/cli-ref.md

@@ -91,7 +91,7 @@ TLS key
 Defines additional resource attributes (key:value).
 
 `--accesslog.otlp.servicename`:  
-Set the name for this service. (Default: ```traefik```)
+Defines the service name resource attribute. (Default: ```traefik```)
 
 `--api`:  
 Enable api/dashboard. (Default: ```false```)
@@ -481,7 +481,7 @@ TLS key
 Defines additional resource attributes (key:value).
 
 `--log.otlp.servicename`:  
-Set the name for this service. (Default: ```traefik```)
+Defines the service name resource attribute. (Default: ```traefik```)
 
 `--metrics.addinternals`:  
 Enables metrics for internal services (ping, dashboard, etc...). (Default: ```false```)
@@ -600,8 +600,11 @@ TLS key
 `--metrics.otlp.pushinterval`:  
 Period between calls to collect a checkpoint. (Default: ```10```)
 
+`--metrics.otlp.resourceattributes.<name>`:  
+Defines additional resource attributes (key:value).
+
 `--metrics.otlp.servicename`:  
-OTEL service name to use. (Default: ```traefik```)
+Defines the service name resource attribute. (Default: ```traefik```)
 
 `--metrics.prometheus`:  
 Prometheus metrics exporter type. (Default: ```false```)
@@ -1414,4 +1417,4 @@ Query params to not redact.
 Sets the rate between 0.0 and 1.0 of requests to trace. (Default: ```1.000000```)
 
 `--tracing.servicename`:  
-Sets the name for this service. (Default: ```traefik```)
+Defines the service name resource attribute. (Default: ```traefik```)

docs/content/reference/static-configuration/env-ref.md

@@ -91,7 +91,7 @@ TLS key
 Defines additional resource attributes (key:value).
 
 `TRAEFIK_ACCESSLOG_OTLP_SERVICENAME`:  
-Set the name for this service. (Default: ```traefik```)
+Defines the service name resource attribute. (Default: ```traefik```)
 
 `TRAEFIK_API`:  
 Enable api/dashboard. (Default: ```false```)
@@ -481,7 +481,7 @@ TLS key
 Defines additional resource attributes (key:value).
 
 `TRAEFIK_LOG_OTLP_SERVICENAME`:  
-Set the name for this service. (Default: ```traefik```)
+Defines the service name resource attribute. (Default: ```traefik```)
 
 `TRAEFIK_METRICS_ADDINTERNALS`:  
 Enables metrics for internal services (ping, dashboard, etc...). (Default: ```false```)
@@ -600,8 +600,11 @@ TLS key
 `TRAEFIK_METRICS_OTLP_PUSHINTERVAL`:  
 Period between calls to collect a checkpoint. (Default: ```10```)
 
+`TRAEFIK_METRICS_OTLP_RESOURCEATTRIBUTES_<NAME>`:  
+Defines additional resource attributes (key:value).
+
 `TRAEFIK_METRICS_OTLP_SERVICENAME`:  
-OTEL service name to use. (Default: ```traefik```)
+Defines the service name resource attribute. (Default: ```traefik```)
 
 `TRAEFIK_METRICS_PROMETHEUS`:  
 Prometheus metrics exporter type. (Default: ```false```)
@@ -1414,4 +1417,4 @@ Query params to not redact.
 Sets the rate between 0.0 and 1.0 of requests to trace. (Default: ```1.000000```)
 
 `TRAEFIK_TRACING_SERVICENAME`:  
-Sets the name for this service. (Default: ```traefik```)
+Defines the service name resource attribute. (Default: ```traefik```)

docs/content/reference/static-configuration/file.toml

@@ -388,6 +388,9 @@
       [metrics.otlp.http.headers]
         name0 = "foobar"
         name1 = "foobar"
+    [metrics.otlp.resourceAttributes]
+      name0 = "foobar"
+      name1 = "foobar"
 
 [ping]
   entryPoint = "foobar"

docs/content/reference/static-configuration/file.yaml

@@ -429,6 +429,9 @@ metrics:
       - 42
     pushInterval: 42s
     serviceName: foobar
+    resourceAttributes:
+      name0: foobar
+      name1: foobar
 ping:
   entryPoint: foobar
   manualRouting: true