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+// Copyright 2016 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package google.devtools.cloudtrace.v1;
+
+import "google/api/annotations.proto";
+import "google/protobuf/empty.proto";
+import "google/protobuf/timestamp.proto";
+
+option csharp_namespace = "Google.Cloud.Trace.V1";
+option go_package = "google.golang.org/genproto/googleapis/devtools/cloudtrace/v1;cloudtrace";
+option java_multiple_files = true;
+option java_outer_classname = "TraceProto";
+option java_package = "com.google.devtools.cloudtrace.v1";
+
+
+// This file describes an API for collecting and viewing traces and spans
+// within a trace.  A Trace is a collection of spans corresponding to a single
+// operation or set of operations for an application. A span is an individual
+// timed event which forms a node of the trace tree. Spans for a single trace
+// may span multiple services.
+service TraceService {
+  // Returns of a list of traces that match the specified filter conditions.
+  rpc ListTraces(ListTracesRequest) returns (ListTracesResponse) {
+    option (google.api.http) = { get: "/v1/projects/{project_id}/traces" };
+  }
+
+  // Gets a single trace by its ID.
+  rpc GetTrace(GetTraceRequest) returns (Trace) {
+    option (google.api.http) = { get: "/v1/projects/{project_id}/traces/{trace_id}" };
+  }
+
+  // Sends new traces to Stackdriver Trace or updates existing traces. If the ID
+  // of a trace that you send matches that of an existing trace, any fields
+  // in the existing trace and its spans are overwritten by the provided values,
+  // and any new fields provided are merged with the existing trace data. If the
+  // ID does not match, a new trace is created.
+  rpc PatchTraces(PatchTracesRequest) returns (google.protobuf.Empty) {
+    option (google.api.http) = { patch: "/v1/projects/{project_id}/traces" body: "traces" };
+  }
+}
+
+// A trace describes how long it takes for an application to perform an
+// operation. It consists of a set of spans, each of which represent a single
+// timed event within the operation.
+message Trace {
+  // Project ID of the Cloud project where the trace data is stored.
+  string project_id = 1;
+
+  // Globally unique identifier for the trace. This identifier is a 128-bit
+  // numeric value formatted as a 32-byte hex string.
+  string trace_id = 2;
+
+  // Collection of spans in the trace.
+  repeated TraceSpan spans = 3;
+}
+
+// List of new or updated traces.
+message Traces {
+  // List of traces.
+  repeated Trace traces = 1;
+}
+
+// A span represents a single timed event within a trace. Spans can be nested
+// and form a trace tree. Often, a trace contains a root span that describes the
+// end-to-end latency of an operation and, optionally, one or more subspans for
+// its suboperations. Spans do not need to be contiguous. There may be gaps
+// between spans in a trace.
+message TraceSpan {
+  // Type of span. Can be used to specify additional relationships between spans
+  // in addition to a parent/child relationship.
+  enum SpanKind {
+    // Unspecified.
+    SPAN_KIND_UNSPECIFIED = 0;
+
+    // Indicates that the span covers server-side handling of an RPC or other
+    // remote network request.
+    RPC_SERVER = 1;
+
+    // Indicates that the span covers the client-side wrapper around an RPC or
+    // other remote request.
+    RPC_CLIENT = 2;
+  }
+
+  // Identifier for the span. Must be a 64-bit integer other than 0 and
+  // unique within a trace.
+  fixed64 span_id = 1;
+
+  // Distinguishes between spans generated in a particular context. For example,
+  // two spans with the same name may be distinguished using `RPC_CLIENT`
+  // and `RPC_SERVER` to identify queueing latency associated with the span.
+  SpanKind kind = 2;
+
+  // Name of the trace. The trace name is sanitized and displayed in the
+  // Stackdriver Trace tool in the Google Developers Console.
+  // The name may be a method name or some other per-call site name.
+  // For the same executable and the same call point, a best practice is
+  // to use a consistent name, which makes it easier to correlate
+  // cross-trace spans.
+  string name = 3;
+
+  // Start time of the span in nanoseconds from the UNIX epoch.
+  google.protobuf.Timestamp start_time = 4;
+
+  // End time of the span in nanoseconds from the UNIX epoch.
+  google.protobuf.Timestamp end_time = 5;
+
+  // ID of the parent span, if any. Optional.
+  fixed64 parent_span_id = 6;
+
+  // Collection of labels associated with the span.
+  map<string, string> labels = 7;
+}
+
+// The request message for the `ListTraces` method. All fields are required
+// unless specified.
+message ListTracesRequest {
+  // Type of data returned for traces in the list.
+  enum ViewType {
+    // Default is `MINIMAL` if unspecified.
+    VIEW_TYPE_UNSPECIFIED = 0;
+
+    // Minimal view of the trace record that contains only the project
+    // and trace IDs.
+    MINIMAL = 1;
+
+    // Root span view of the trace record that returns the root spans along
+    // with the minimal trace data.
+    ROOTSPAN = 2;
+
+    // Complete view of the trace record that contains the actual trace data.
+    // This is equivalent to calling the REST `get` or RPC `GetTrace` method
+    // using the ID of each listed trace.
+    COMPLETE = 3;
+  }
+
+  // ID of the Cloud project where the trace data is stored.
+  string project_id = 1;
+
+  // Type of data returned for traces in the list. Optional. Default is
+  // `MINIMAL`.
+  ViewType view = 2;
+
+  // Maximum number of traces to return. If not specified or <= 0, the
+  // implementation selects a reasonable value.  The implementation may
+  // return fewer traces than the requested page size. Optional.
+  int32 page_size = 3;
+
+  // Token identifying the page of results to return. If provided, use the
+  // value of the `next_page_token` field from a previous request. Optional.
+  string page_token = 4;
+
+  // End of the time interval (inclusive) during which the trace data was
+  // collected from the application.
+  google.protobuf.Timestamp start_time = 5;
+
+  // Start of the time interval (inclusive) during which the trace data was
+  // collected from the application.
+  google.protobuf.Timestamp end_time = 6;
+
+  // An optional filter for the request.
+  string filter = 7;
+
+  // Field used to sort the returned traces. Optional.
+  // Can be one of the following:
+  //
+  // *   `trace_id`
+  // *   `name` (`name` field of root span in the trace)
+  // *   `duration` (difference between `end_time` and `start_time` fields of
+  //      the root span)
+  // *   `start` (`start_time` field of the root span)
+  //
+  // Descending order can be specified by appending `desc` to the sort field
+  // (for example, `name desc`).
+  //
+  // Only one sort field is permitted.
+  string order_by = 8;
+}
+
+// The response message for the `ListTraces` method.
+message ListTracesResponse {
+  // List of trace records returned.
+  repeated Trace traces = 1;
+
+  // If defined, indicates that there are more traces that match the request
+  // and that this value should be passed to the next request to continue
+  // retrieving additional traces.
+  string next_page_token = 2;
+}
+
+// The request message for the `GetTrace` method.
+message GetTraceRequest {
+  // ID of the Cloud project where the trace data is stored.
+  string project_id = 1;
+
+  // ID of the trace to return.
+  string trace_id = 2;
+}
+
+// The request message for the `PatchTraces` method.
+message PatchTracesRequest {
+  // ID of the Cloud project where the trace data is stored.
+  string project_id = 1;
+
+  // The body of the message.
+  Traces traces = 2;
+}