diff --git a/docs/content/observability/tracing/datadog.md b/docs/content/observability/tracing/datadog.md
index 5d68d399d..92da66d7b 100644
--- a/docs/content/observability/tracing/datadog.md
+++ b/docs/content/observability/tracing/datadog.md
@@ -2,11 +2,16 @@
 
 To enable the DataDog:
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.dataDog]
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  dataDog: {}
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.datadog
@@ -18,12 +23,18 @@ _Required, Default="127.0.0.1:8126"_
 
 Local Agent Host Port instructs reporter to send spans to datadog-tracing-agent at this address.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.dataDog]
     localAgentHostPort = "127.0.0.1:8126"
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  dataDog:
+    localAgentHostPort: 127.0.0.1:8126
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.datadog.localAgentHostPort="127.0.0.1:8126"
@@ -35,12 +46,18 @@ _Optional, Default=false_
 
 Enable DataDog debug.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.dataDog]
     debug = true
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  dataDog:
+    debug: true
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.datadog.debug=true
@@ -52,12 +69,18 @@ _Optional, Default=empty_
 
 Apply shared tag in a form of Key:Value to all the traces.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.dataDog]
     globalTag = "sample"
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  dataDog:
+    globalTag: sample
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.datadog.globalTag="sample"
@@ -70,12 +93,18 @@ _Optional, Default=false_
 Enable priority sampling. When using distributed tracing,
 this option must be enabled in order to get all the parts of a distributed trace sampled.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.dataDog]
     prioritySampling = true
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  dataDog:
+    prioritySampling: true
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.datadog.prioritySampling=true
diff --git a/docs/content/observability/tracing/haystack.md b/docs/content/observability/tracing/haystack.md
index 6b6b1ac0d..86557c220 100644
--- a/docs/content/observability/tracing/haystack.md
+++ b/docs/content/observability/tracing/haystack.md
@@ -2,11 +2,16 @@
 
 To enable the Haystack:
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.haystack]
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  haystack: {}
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.haystack
@@ -18,12 +23,18 @@ _Require, Default="127.0.0.1"_
 
 Local Agent Host instructs reporter to send spans to haystack-agent at this address.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.haystack]
     localAgentHost = "127.0.0.1"
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  haystack:
+    localAgentHost: 127.0.0.1
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.haystack.localAgentHost="127.0.0.1"
@@ -35,12 +46,18 @@ _Require, Default=42699_
 
 Local Agent port instructs reporter to send spans to the haystack-agent at this port.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.haystack]
     localAgentPort = 42699
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  haystack:
+    localAgentPort: 42699
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.haystack.localAgentPort=42699
@@ -52,12 +69,18 @@ _Optional, Default=empty_
 
 Apply shared tag in a form of Key:Value to all the traces.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.haystack]
     globalTag = "sample:test"
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  haystack:
+    globalTag: sample:test
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.haystack.globalTag="sample:test"
@@ -69,12 +92,18 @@ _Optional, Default=empty_
 
 Specifies the header name that will be used to store the trace ID.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.haystack]
     traceIDHeaderName = "sample"
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  haystack:
+    traceIDHeaderName: sample
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.haystack.traceIDHeaderName="sample"
@@ -86,12 +115,18 @@ _Optional, Default=empty_
 
 Specifies the header name that will be used to store the span ID.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.haystack]
     parentIDHeaderName = "sample"
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  haystack:
+    parentIDHeaderName: "sample"
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.haystack.parentIDHeaderName="sample"
@@ -103,15 +138,21 @@ _Optional, Default=empty_
 
 Apply shared tag in a form of Key:Value to all the traces.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.haystack]
     spanIDHeaderName = "sample:test"
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  haystack:
+    spanIDHeaderName: "sample:test"
+```
+
 ```bash tab="CLI"
 --tracing
---tracing.haystack.spanIDHeaderName="sample:test"
+--tracing.haystack.spanIDHeaderName=sample:test
 ```
 
 #### `baggagePrefixHeaderName`
@@ -120,12 +161,19 @@ _Optional, Default=empty_
 
 Specifies the header name prefix that will be used to store baggage items in a map.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.haystack]
     baggagePrefixHeaderName = "sample"
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  haystack:
+    baggagePrefixHeaderName: "sample"
+```
+
+
 ```bash tab="CLI"
 --tracing
 --tracing.haystack.baggagePrefixHeaderName="sample"
diff --git a/docs/content/observability/tracing/instana.md b/docs/content/observability/tracing/instana.md
index 66c09f744..27daa3304 100644
--- a/docs/content/observability/tracing/instana.md
+++ b/docs/content/observability/tracing/instana.md
@@ -2,11 +2,16 @@
 
 To enable the Instana:
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.instana]
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  instana: {}
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.instana
@@ -18,12 +23,18 @@ _Require, Default="127.0.0.1"_
 
 Local Agent Host instructs reporter to send spans to instana-agent at this address.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.instana]
     localAgentHost = "127.0.0.1"
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  instana:
+    localAgentHost: 127.0.0.1
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.instana.localAgentHost="127.0.0.1"
@@ -35,12 +46,18 @@ _Require, Default=42699_
 
 Local Agent port instructs reporter to send spans to the instana-agent at this port.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.instana]
     localAgentPort = 42699
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  instana:
+    localAgentPort: 42699
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.instana.localAgentPort=42699
@@ -59,12 +76,18 @@ Valid values for logLevel field are:
 - `debug`
 - `info`
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.instana]
     logLevel = "info"
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  instana:
+    logLevel: info
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.instana.logLevel="info"
diff --git a/docs/content/observability/tracing/jaeger.md b/docs/content/observability/tracing/jaeger.md
index 1f1ed3a0e..0979ff6e1 100644
--- a/docs/content/observability/tracing/jaeger.md
+++ b/docs/content/observability/tracing/jaeger.md
@@ -2,11 +2,16 @@
 
 To enable the Jaeger:
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.jaeger]
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  jaeger: {}
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.jaeger
@@ -22,12 +27,18 @@ _Required, Default="http://localhost:5778/sampling"_
 
 Sampling Server URL is the address of jaeger-agent's HTTP sampling server.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.jaeger]
     samplingServerURL = "http://localhost:5778/sampling"
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  jaeger:
+    samplingServerURL: http://localhost:5778/sampling
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.jaeger.samplingServerURL="http://localhost:5778/sampling"
@@ -39,12 +50,18 @@ _Required, Default="const"_
 
 Sampling Type specifies the type of the sampler: `const`, `probabilistic`, `rateLimiting`.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.jaeger]
     samplingType = "const"
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  jaeger:
+    samplingType: const
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.jaeger.samplingType="const"
@@ -62,12 +79,18 @@ Valid values for Param field are:
 - for `probabilistic` sampler, a probability between 0 and 1
 - for `rateLimiting` sampler, the number of spans per second
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.jaeger]
     samplingParam = 1.0
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  jaeger:
+    samplingParam: 1.0
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.jaeger.samplingParam="1.0"
@@ -79,12 +102,18 @@ _Required, Default="127.0.0.1:6831"_
 
 Local Agent Host Port instructs reporter to send spans to jaeger-agent at this address.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.jaeger]
     localAgentHostPort = "127.0.0.1:6831"
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  jaeger:
+    localAgentHostPort: 127.0.0.1:6831
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.jaeger.localAgentHostPort="127.0.0.1:6831"
@@ -96,12 +125,18 @@ _Optional, Default=false_
 
 Generate 128-bit trace IDs, compatible with OpenCensus.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.jaeger]
     gen128Bit = true
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  jaeger:
+    gen128Bit: true
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.jaeger.gen128Bit
@@ -117,12 +152,18 @@ This can be either:
 - `jaeger`, jaeger's default trace header.
 - `b3`, compatible with OpenZipkin
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.jaeger]
     propagation = "jaeger"
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  jaeger:
+    propagation: jaeger
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.jaeger.propagation="jaeger"
@@ -135,12 +176,18 @@ _Required, Default="uber-trace-id"_
 Trace Context Header Name is the http header name used to propagate tracing context.
 This must be in lower-case to avoid mismatches when decoding incoming headers.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.jaeger]
     traceContextHeaderName = "uber-trace-id"
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  jaeger:
+    traceContextHeaderName: uber-trace-id
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.jaeger.traceContextHeaderName="uber-trace-id"
@@ -153,12 +200,19 @@ _Optional, Default=""_
 
 Collector Endpoint instructs reporter to send spans to jaeger-collector at this URL.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.jaeger.collector]
     endpoint = "http://127.0.0.1:14268/api/traces?format=jaeger.thrift"
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  jaeger:
+    collector:
+        endpoint: http://127.0.0.1:14268/api/traces?format=jaeger.thrift
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.jaeger.collector.endpoint="http://127.0.0.1:14268/api/traces?format=jaeger.thrift"
@@ -170,12 +224,19 @@ _Optional, Default=""_
 
 User instructs reporter to include a user for basic http authentication when sending spans to jaeger-collector.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.jaeger.collector]
     user = "my-user"
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  jaeger:
+    collector:
+        user: my-user
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.jaeger.collector.user="my-user"
@@ -187,12 +248,19 @@ _Optional, Default=""_
 
 Password instructs reporter to include a password for basic http authentication when sending spans to jaeger-collector.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.jaeger.collector]
     password = "my-password"
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  jaeger:
+    collector:
+        password: my-password
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.jaeger.collector.password="my-password"
diff --git a/docs/content/observability/tracing/overview.md b/docs/content/observability/tracing/overview.md
index 2de86bd07..4b0ad2cba 100644
--- a/docs/content/observability/tracing/overview.md
+++ b/docs/content/observability/tracing/overview.md
@@ -21,10 +21,14 @@ By default, Traefik uses Jaeger as tracing backend.
 
 To enable the tracing:
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
 ```
 
+```yaml tab="File (YAML)"
+tracing: {}
+```
+
 ```bash tab="CLI"
 --tracing
 ```
@@ -37,11 +41,16 @@ _Required, Default="traefik"_
 
 Service name used in selected backend.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   serviceName = "traefik"
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  serviceName: traefik
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.serviceName="traefik"
@@ -56,11 +65,16 @@ This can prevent certain tracing providers to drop traces that exceed their leng
 
 `0` means no truncation will occur.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   spanNameLimit = 150
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  spanNameLimit: 150
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.spanNameLimit=150
diff --git a/docs/content/observability/tracing/zipkin.md b/docs/content/observability/tracing/zipkin.md
index 14954468d..dc2665e85 100644
--- a/docs/content/observability/tracing/zipkin.md
+++ b/docs/content/observability/tracing/zipkin.md
@@ -2,11 +2,16 @@
 
 To enable the Zipkin:
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.zipkin]
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  zipkin: {}
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.zipkin
@@ -18,12 +23,18 @@ _Required, Default="http://localhost:9411/api/v1/spans"_
 
 Zipkin HTTP endpoint used to send data.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.zipkin]
     httpEndpoint = "http://localhost:9411/api/v1/spans"
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  zipkin:
+    httpEndpoint: http://localhost:9411/api/v1/spans
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.zipkin.httpEndpoint="http://localhost:9411/api/v1/spans"
@@ -35,12 +46,18 @@ _Optional, Default=false_
 
 Enable Zipkin debug.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.zipkin]
     debug = true
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  zipkin:
+    debug: true
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.zipkin.debug=true
@@ -52,12 +69,18 @@ _Optional, Default=false_
 
 Use Zipkin SameSpan RPC style traces.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.zipkin]
     sameSpan = true
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  zipkin:
+    sameSpan: true
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.zipkin.sameSpan=true
@@ -69,12 +92,18 @@ _Optional, Default=true_
 
 Use Zipkin 128 bit root span IDs.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.zipkin]
     id128Bit = false
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  zipkin:
+    id128Bit: false
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.zipkin.id128Bit=false
@@ -86,12 +115,18 @@ _Required, Default=1.0_
 
 The rate between 0.0 and 1.0 of requests to trace.
 
-```toml tab="File"
+```toml tab="File (TOML)"
 [tracing]
   [tracing.zipkin]
     sampleRate = 0.2
 ```
 
+```yaml tab="File (YAML)"
+tracing:
+  zipkin:
+    sampleRate: 0.2
+```
+
 ```bash tab="CLI"
 --tracing
 --tracing.zipkin.sampleRate="0.2"