Add support to send DataDog traces via Unix Socket

docs/content/observability/tracing/datadog.md

@@ -23,24 +23,46 @@ tracing:
 
 #### `localAgentHostPort`
 
-_Required, Default="127.0.0.1:8126"_
+_Optional, Default="localhost:8126"_
 
 Local Agent Host Port instructs the reporter to send spans to the Datadog Agent at this address (host:port).
 
 ```yaml tab="File (YAML)"
 tracing:
   datadog:
-    localAgentHostPort: 127.0.0.1:8126
+    localAgentHostPort: localhost:8126
 ```
 
 ```toml tab="File (TOML)"
 [tracing]
   [tracing.datadog]
-    localAgentHostPort = "127.0.0.1:8126"
+    localAgentHostPort = "localhost:8126"
 ```
 
 ```bash tab="CLI"
---tracing.datadog.localAgentHostPort=127.0.0.1:8126
+--tracing.datadog.localAgentHostPort=localhost:8126
+```
+
+#### `localAgentSocket`
+
+_Optional, Default=""_
+
+Local Agent Socket instructs the reporter to send spans to the Datadog Agent at this UNIX socket.
+
+```yaml tab="File (YAML)"
+tracing:
+  datadog:
+    localAgentSocket: /var/run/datadog/apm.socket
+```
+
+```toml tab="File (TOML)"
+[tracing]
+  [tracing.datadog]
+    localAgentSocket = "/var/run/datadog/apm.socket"
+```
+
+```bash tab="CLI"
+--tracing.datadog.localAgentSocket=/var/run/datadog/apm.socket
 ```
 
 #### `debug`

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