Improve tracing

docs/content/observability/tracing/zipkin.md

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+# Zipkin
+
+To enable the Zipkin:
+
+```toml tab="File"
+[tracing]
+  [tracing.zipkin]
+```
+
+```bash tab="CLI"
+--tracing
+--tracing.zipkin
+```
+
+#### `httpEndpoint`
+
+_Required, Default="http://localhost:9411/api/v1/spans"_
+
+Zipkin HTTP endpoint used to send data.
+
+```toml tab="File"
+[tracing]
+  [tracing.zipkin]
+    httpEndpoint = "http://localhost:9411/api/v1/spans"
+```
+
+```bash tab="CLI"
+--tracing
+--tracing.zipkin.httpEndpoint="http://localhost:9411/api/v1/spans"
+```
+
+#### `debug`
+
+_Optional, Default=false_
+
+Enable Zipkin debug.
+
+```toml tab="File"
+[tracing]
+  [tracing.zipkin]
+    debug = true
+```
+
+```bash tab="CLI"
+--tracing
+--tracing.zipkin.debug=true
+```
+
+#### `sameSpan`
+
+_Optional, Default=false_
+
+Use Zipkin SameSpan RPC style traces.
+
+```toml tab="File"
+[tracing]
+  [tracing.zipkin]
+    sameSpan = true
+```
+
+```bash tab="CLI"
+--tracing
+--tracing.zipkin.sameSpan=true
+```
+
+#### `id128Bit`
+
+_Optional, Default=true_
+
+Use Zipkin 128 bit root span IDs.
+
+```toml tab="File"
+[tracing]
+  [tracing.zipkin]
+    id128Bit = false
+```
+
+```bash tab="CLI"
+--tracing
+--tracing.zipkin.id128Bit=false
+```
+
+#### `sampleRate`
+
+_Required, Default=1.0_
+
+The rate between 0.0 and 1.0 of requests to trace.
+
+```toml tab="File"
+[tracing]
+  [tracing.zipkin]
+    sampleRate = 0.2
+```
+
+```bash tab="CLI"
+--tracing
+--tracing.zipkin.sampleRate="0.2"
+```