Add support to send DataDog traces via Unix Socket

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

@@ -990,6 +990,9 @@ Sets a list of key:value tags on all spans.
 `--tracing.datadog.localagenthostport`:  
 Sets the Datadog Agent host:port. (Default: ```localhost:8126```)
 
+`--tracing.datadog.localagentsocket`:  
+Sets the socket for the Datadog Agent.
+
 `--tracing.datadog.parentidheadername`:  
 Sets the header name used to store the parent ID.
 

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

@@ -990,6 +990,9 @@ Sets a list of key:value tags on all spans.
 `TRAEFIK_TRACING_DATADOG_LOCALAGENTHOSTPORT`:  
 Sets the Datadog Agent host:port. (Default: ```localhost:8126```)
 
+`TRAEFIK_TRACING_DATADOG_LOCALAGENTSOCKET`:  
+Sets the socket for the Datadog Agent.
+
 `TRAEFIK_TRACING_DATADOG_PARENTIDHEADERNAME`:  
 Sets the header name used to store the parent ID.
 

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

@@ -365,6 +365,7 @@
     sampleRate = 42.0
   [tracing.datadog]
     localAgentHostPort = "foobar"
+    localAgentSocket = "foobar"
     globalTag = "foobar"
     [tracing.datadog.globalTags]
       tag1 = "foobar"

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

@@ -389,6 +389,7 @@ tracing:
     sampleRate: 42
   datadog:
     localAgentHostPort: foobar
+    localAgentSocket: foobar
     globalTag: foobar
     globalTags:
       tag1: foobar