Enum value maps for Trace_CachePolicy_Scope.

Enum value maps for Trace_CachePolicy_Scope.

Enum value maps for Trace_HTTP_Method.

Enum value maps for Trace_HTTP_Method.

This is the top-level message used by the new traces ingress.

The `service` value embedded within the header key is not guaranteed to contain an actual service, and, in most cases, the service information is trusted to come from upstream processing.

We store information on each resolver execution as a Node on a tree.

represents a node in the query plan, under which there is a trace tree for that service fetch.

This represents a node to send an operation to an implementing service.

This node represents a way to reach into the response path and attach related entities.

This represents a set of nodes to be executed in parallel by the Gateway executor.

This represents a set of nodes to be executed sequentially by the Gateway executor.

A sequence of traces and stats.