Improve tracing

docs/content/reference/static-configuration/cli.txt

@@ -490,9 +490,6 @@
 --tracing  (Default: "false")
     OpenTracing configuration.
 
---tracing.backend  (Default: "jaeger")
-    Selects the tracking backend ('jaeger','zipkin','datadog','instana').
-
 --tracing.datadog  (Default: "false")
     Settings for DataDog.
 
@@ -526,7 +523,7 @@
     Settings for Haystack.
 
 --tracing.haystack.baggageprefixheadername  (Default: "")
-    specifies the header name prefix that will be used to store baggage items in a
+    Specifies the header name prefix that will be used to store baggage items in a
     map.
 
 --tracing.haystack.globaltag  (Default: "")

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

@@ -474,9 +474,6 @@ Add cert file for self-signed certificate.
 `TRAEFIK_TRACING`:  
 OpenTracing configuration. (Default: ```false```)
 
-`TRAEFIK_TRACING_BACKEND`:  
-Selects the tracking backend ('jaeger','zipkin','datadog','instana'). (Default: ```jaeger```)
-
 `TRAEFIK_TRACING_DATADOG`:  
 Settings for DataDog. (Default: ```false```)
 

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

@@ -177,7 +177,6 @@
         name1 = "foobar"
 
 [Tracing]
-  Backend = "foobar"
   ServiceName = "foobar"
   SpanNameLimit = 42
 
@@ -212,6 +211,14 @@
     LocalAgentPort = 42
     LogLevel = "foobar"
 
+  [Tracing.Haystack]
+    LocalAgentHost = "foobar"
+    LocalAgentPort = 42
+    GlobalTag = "foobar"
+    ParentIDHeaderName = "foobar"
+    SpanIDHeaderName = "foobar"
+    TraceIDHeaderName = "foobar"
+
 [HostResolver]
   CnameFlattening = true
   ResolvConfig = "foobar"