Improve tracing

docs/content/observability/tracing/instana.md

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+# Instana
+
+To enable the Instana:
+
+```toml tab="File"
+[tracing]
+  [tracing.instana]
+```
+
+```bash tab="CLI"
+--tracing
+--tracing.instana
+```
+
+#### `localAgentHost`
+
+_Require, Default="127.0.0.1"_
+
+Local Agent Host instructs reporter to send spans to instana-agent at this address.
+
+```toml tab="File"
+[tracing]
+  [tracing.instana]
+    localAgentHost = "127.0.0.1"
+```
+
+```bash tab="CLI"
+--tracing
+--tracing.instana.localAgentHost="127.0.0.1"
+```
+
+#### `localAgentPort`
+
+_Require, Default=42699_
+
+Local Agent port instructs reporter to send spans to the instana-agent at this port.
+
+```toml tab="File"
+[tracing]
+  [tracing.instana]
+    localAgentPort = 42699
+```
+
+```bash tab="CLI"
+--tracing
+--tracing.instana.localAgentPort=42699
+```
+
+#### `logLevel`
+
+_Require, Default="info"_
+
+Set Instana tracer log level.
+
+Valid values for logLevel field are:
+
+- `error`
+- `warn`
+- `debug`
+- `info`
+
+```toml tab="File"
+[tracing]
+  [tracing.instana]
+    logLevel = "info"
+```
+
+```bash tab="CLI"
+--tracing
+--tracing.instana.logLevel="info"
+```