gateway: Add documentation for AdditionalSpanTags config
@@ -261,6 +261,22 @@ Use caution when leveraging this feature: every expression, and the complexity o
"SpanNameReplacementBreakAfterMatch": false
}
+##### Add tags to Spans
+
+The SignalFx listener has the ability to add tags to every span that passes through it.
+`AdditionalSpanTags` defines a set of tag name/value pairs that will be included on every span.
+
+Warning: The tags defined by `AdditionalSpanTags` will overwrite any existing values that are using the same tag name
+
+ {
+ "Type": "signalfx",
+ "ListenAddr": "0.0.0.0:18080",
+ "AdditionalSpanTags": {
+ "foo": "bar",
+ "key": "value"
+ }
+ }
+
##### collectd listener
You can receive data sent by CollectD by setting up a `collectd` endpoint.
