add documentation

DataDog · May 30, 2024 · 8b89a37 · 8b89a37
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+# Shared Variables
+
+The plugin shares variables that can be accessed by other plugins through [kong.ctx.shared](https://docs.konghq.com/gateway/latest/plugin-development/pdk/kong.ctx/#kongctxshared).
+
+- `kong_shared.datadog_sdk_trace_id` is the TraceID of the current request.
+- `kong_shared.datadog_sdk_span_id` is the SpanID of the current request.