SpanMetadataCustomizer

Customizes span names and attributes (input arguments and outputs) for instrumented method calls.

Implementations must be Kotlin object declarations — classes are not supported.

Use this interface to:

• Override the default span name resolution via resolveSpanName.

• Transform input arguments into structured string representations via formatInputAttributes.

• Convert method return values into structured string representations via formatOutputAttribute.

All methods are optional to override and each has a default implementation, so you only need to override what you want to customize:

object MyCustomizer : SpanMetadataCustomizer {
    override fun resolveSpanName(method: PlatformMethod, args: Array<Any?>): String =
        "Tool: ${method.declaringClass.simpleName}"
}

Inheritors