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// Copyright 2017, OpenCensus Authors
//
// 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 opencensus.proto.trace.v1;
import "opencensus/proto/resource/v1/resource.proto";
import "google/protobuf/timestamp.proto";
import "google/protobuf/wrappers.proto";
option java_multiple_files = true;
option java_package = "io.opencensus.proto.trace.v1";
option java_outer_classname = "TraceProto";
option go_package = "github.com/census-instrumentation/opencensus-proto/gen-go/trace/v1";
// A span represents a single operation within a trace. Spans can be
// nested to form a trace tree. Spans may also be linked to other spans
// from the same or different trace. And form graphs. Often, a trace
// contains a root span that describes the end-to-end latency, and one
// or more subspans for its sub-operations. A trace can also contain
// multiple root spans, or none at all. Spans do not need to be
// contiguous - there may be gaps or overlaps between spans in a trace.
//
// The next id is 17.
// TODO(bdrutu): Add an example.
message Span {
// A unique identifier for a trace. All spans from the same trace share
// the same `trace_id`. The ID is a 16-byte array. An ID with all zeroes
// is considered invalid.
//
// This field is semantically required. Receiver should generate new
// random trace_id if empty or invalid trace_id was received.
//
// This field is required.
bytes trace_id = 1;
// A unique identifier for a span within a trace, assigned when the span
// is created. The ID is an 8-byte array. An ID with all zeroes is considered
// invalid.
//
// This field is semantically required. Receiver should generate new
// random span_id if empty or invalid span_id was received.
//
// This field is required.
bytes span_id = 2;
// This field conveys information about request position in multiple distributed tracing graphs.
// It is a list of Tracestate.Entry with a maximum of 32 members in the list.
//
// See the https://github.com/w3c/distributed-tracing for more details about this field.
message Tracestate {
message Entry {
// The key must begin with a lowercase letter, and can only contain
// lowercase letters 'a'-'z', digits '0'-'9', underscores '_', dashes
// '-', asterisks '*', and forward slashes '/'.
string key = 1;
// The value is opaque string up to 256 characters printable ASCII
// RFC0020 characters (i.e., the range 0x20 to 0x7E) except ',' and '='.
// Note that this also excludes tabs, newlines, carriage returns, etc.
string value = 2;
}
// A list of entries that represent the Tracestate.
repeated Entry entries = 1;
}
// The Tracestate on the span.
Tracestate tracestate = 15;
// The `span_id` of this span's parent span. If this is a root span, then this
// field must be empty. The ID is an 8-byte array.
bytes parent_span_id = 3;
// A description of the span's operation.
//
// For example, the name can be a qualified method name or a file name
// and a line number where the operation is called. A best practice is to use
// the same display name at the same call point in an application.
// This makes it easier to correlate spans in different traces.
//
// This field is semantically required to be set to non-empty string.
// When null or empty string received - receiver may use string "name"
// as a replacement. There might be smarted algorithms implemented by
// receiver to fix the empty span name.
//
// This field is required.
TruncatableString name = 4;
// 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.
SERVER = 1;
// Indicates that the span covers the client-side wrapper around an RPC or
// other remote request.
CLIENT = 2;
}
// Distinguishes between spans generated in a particular context. For example,
// two spans with the same name may be distinguished using `CLIENT` (caller)
// and `SERVER` (callee) to identify queueing latency associated with the span.
SpanKind kind = 14;
// The start time of the span. On the client side, this is the time kept by
// the local machine where the span execution starts. On the server side, this
// is the time when the server's application handler starts running.
//
// This field is semantically required. When not set on receive -
// receiver should set it to the value of end_time field if it was
// set. Or to the current time if neither was set. It is important to
// keep end_time > start_time for consistency.
//
// This field is required.
google.protobuf.Timestamp start_time = 5;
// The end time of the span. On the client side, this is the time kept by
// the local machine where the span execution ends. On the server side, this
// is the time when the server application handler stops running.
//
// This field is semantically required. When not set on receive -
// receiver should set it to start_time value. It is important to
// keep end_time > start_time for consistency.
//
// This field is required.
google.protobuf.Timestamp end_time = 6;
// A set of attributes, each with a key and a value.
message Attributes {
// The set of attributes. The value can be a string, an integer, a double
// or the Boolean values `true` or `false`. Note, global attributes like
// server name can be set as tags using resource API. Examples of attributes:
//
// "/http/user_agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36"
// "/http/server_latency": 300
// "abc.com/myattribute": true
// "abc.com/score": 10.239
map attribute_map = 1;
// The number of attributes that were discarded. Attributes can be discarded
// because their keys are too long or because there are too many attributes.
// If this value is 0, then no attributes were dropped.
int32 dropped_attributes_count = 2;
}
// A set of attributes on the span.
Attributes attributes = 7;
// A stack trace captured at the start of the span.
StackTrace stack_trace = 8;
// A time-stamped annotation or message event in the Span.
message TimeEvent {
// The time the event occurred.
google.protobuf.Timestamp time = 1;
// A text annotation with a set of attributes.
message Annotation {
// A user-supplied message describing the event.
TruncatableString description = 1;
// A set of attributes on the annotation.
Attributes attributes = 2;
}
// An event describing a message sent/received between Spans.
message MessageEvent {
// Indicates whether the message was sent or received.
enum Type {
// Unknown event type.
TYPE_UNSPECIFIED = 0;
// Indicates a sent message.
SENT = 1;
// Indicates a received message.
RECEIVED = 2;
}
// The type of MessageEvent. Indicates whether the message was sent or
// received.
Type type = 1;
// An identifier for the MessageEvent's message that can be used to match
// SENT and RECEIVED MessageEvents. For example, this field could
// represent a sequence ID for a streaming RPC. It is recommended to be
// unique within a Span.
uint64 id = 2;
// The number of uncompressed bytes sent or received.
uint64 uncompressed_size = 3;
// The number of compressed bytes sent or received. If zero, assumed to
// be the same size as uncompressed.
uint64 compressed_size = 4;
}
// A `TimeEvent` can contain either an `Annotation` object or a
// `MessageEvent` object, but not both.
oneof value {
// A text annotation with a set of attributes.
Annotation annotation = 2;
// An event describing a message sent/received between Spans.
MessageEvent message_event = 3;
}
}
// A collection of `TimeEvent`s. A `TimeEvent` is a time-stamped annotation
// on the span, consisting of either user-supplied key-value pairs, or
// details of a message sent/received between Spans.
message TimeEvents {
// A collection of `TimeEvent`s.
repeated TimeEvent time_event = 1;
// The number of dropped annotations in all the included time events.
// If the value is 0, then no annotations were dropped.
int32 dropped_annotations_count = 2;
// The number of dropped message events in all the included time events.
// If the value is 0, then no message events were dropped.
int32 dropped_message_events_count = 3;
}
// The included time events.
TimeEvents time_events = 9;
// A pointer from the current span to another span in the same trace or in a
// different trace. For example, this can be used in batching operations,
// where a single batch handler processes multiple requests from different
// traces or when the handler receives a request from a different project.
message Link {
// A unique identifier of a trace that this linked span is part of. The ID is a
// 16-byte array.
bytes trace_id = 1;
// A unique identifier for the linked span. The ID is an 8-byte array.
bytes span_id = 2;
// The relationship of the current span relative to the linked span: child,
// parent, or unspecified.
enum Type {
// The relationship of the two spans is unknown, or known but other
// than parent-child.
TYPE_UNSPECIFIED = 0;
// The linked span is a child of the current span.
CHILD_LINKED_SPAN = 1;
// The linked span is a parent of the current span.
PARENT_LINKED_SPAN = 2;
}
// The relationship of the current span relative to the linked span.
Type type = 3;
// A set of attributes on the link.
Attributes attributes = 4;
}
// A collection of links, which are references from this span to a span
// in the same or different trace.
message Links {
// A collection of links.
repeated Link link = 1;
// The number of dropped links after the maximum size was enforced. If
// this value is 0, then no links were dropped.
int32 dropped_links_count = 2;
}
// The included links.
Links links = 10;
// An optional final status for this span. Semantically when Status
// wasn't set it is means span ended without errors and assume
// Status.Ok (code = 0).
Status status = 11;
// An optional resource that is associated with this span. If not set, this span
// should be part of a batch that does include the resource information, unless resource
// information is unknown.
opencensus.proto.resource.v1.Resource resource = 16;
// A highly recommended but not required flag that identifies when a
// trace crosses a process boundary. True when the parent_span belongs
// to the same process as the current span. This flag is most commonly
// used to indicate the need to adjust time as clocks in different
// processes may not be synchronized.
google.protobuf.BoolValue same_process_as_parent_span = 12;
// An optional number of child spans that were generated while this span
// was active. If set, allows an implementation to detect missing child spans.
google.protobuf.UInt32Value child_span_count = 13;
}
// The `Status` type defines a logical error model that is suitable for different
// programming environments, including REST APIs and RPC APIs. This proto's fields
// are a subset of those of
// [google.rpc.Status](https://github.com/googleapis/googleapis/blob/master/google/rpc/status.proto),
// which is used by [gRPC](https://github.com/grpc).
message Status {
// The status code. This is optional field. It is safe to assume 0 (OK)
// when not set.
int32 code = 1;
// A developer-facing error message, which should be in English.
string message = 2;
}
// The value of an Attribute.
message AttributeValue {
// The type of the value.
oneof value {
// A string up to 256 bytes long.
TruncatableString string_value = 1;
// A 64-bit signed integer.
int64 int_value = 2;
// A Boolean value represented by `true` or `false`.
bool bool_value = 3;
// A double value.
double double_value = 4;
}
}
// The call stack which originated this span.
message StackTrace {
// A single stack frame in a stack trace.
message StackFrame {
// The fully-qualified name that uniquely identifies the function or
// method that is active in this frame.
TruncatableString function_name = 1;
// An un-mangled function name, if `function_name` is
// [mangled](http://www.avabodh.com/cxxin/namemangling.html). The name can
// be fully qualified.
TruncatableString original_function_name = 2;
// The name of the source file where the function call appears.
TruncatableString file_name = 3;
// The line number in `file_name` where the function call appears.
int64 line_number = 4;
// The column number where the function call appears, if available.
// This is important in JavaScript because of its anonymous functions.
int64 column_number = 5;
// The binary module from where the code was loaded.
Module load_module = 6;
// The version of the deployed source code.
TruncatableString source_version = 7;
}
// A collection of stack frames, which can be truncated.
message StackFrames {
// Stack frames in this call stack.
repeated StackFrame frame = 1;
// The number of stack frames that were dropped because there
// were too many stack frames.
// If this value is 0, then no stack frames were dropped.
int32 dropped_frames_count = 2;
}
// Stack frames in this stack trace.
StackFrames stack_frames = 1;
// The hash ID is used to conserve network bandwidth for duplicate
// stack traces within a single trace.
//
// Often multiple spans will have identical stack traces.
// The first occurrence of a stack trace should contain both
// `stack_frames` and a value in `stack_trace_hash_id`.
//
// Subsequent spans within the same request can refer
// to that stack trace by setting only `stack_trace_hash_id`.
//
// TODO: describe how to deal with the case where stack_trace_hash_id is
// zero because it was not set.
uint64 stack_trace_hash_id = 2;
}
// A description of a binary module.
message Module {
// TODO: document the meaning of this field.
// For example: main binary, kernel modules, and dynamic libraries
// such as libc.so, sharedlib.so.
TruncatableString module = 1;
// A unique identifier for the module, usually a hash of its
// contents.
TruncatableString build_id = 2;
}
// A string that might be shortened to a specified length.
message TruncatableString {
// The shortened string. For example, if the original string was 500 bytes long and
// the limit of the string was 128 bytes, then this value contains the first 128
// bytes of the 500-byte string. Note that truncation always happens on a
// character boundary, to ensure that a truncated string is still valid UTF-8.
// Because it may contain multi-byte characters, the size of the truncated string
// may be less than the truncation limit.
string value = 1;
// The number of bytes removed from the original string. If this
// value is 0, then the string was not shortened.
int32 truncated_byte_count = 2;
}
