syntax = "proto3";

package datadog.trace;

option go_package = "pkg/proto/pbgo/trace"; // golang

// protoc --gogofaster_out=. -I $GOPATH/src -I . stats.proto

// StatsPayload is the payload used to send stats from the agent to the backend.
message StatsPayload {
	string agentHostname = 1;
	string agentEnv = 2;
  // @gotags: json:"stats,omitempty" msg:"Stats,omitempty"
	repeated ClientStatsPayload stats = 3;
	string agentVersion = 4;
	bool clientComputed = 5;
	// splitPayload indicates if the payload is actually one of several payloads split out from a larger payload.
	// This field can be used in the backend to signal if re-aggregation is necessary.
	bool splitPayload = 6;
}

// ClientStatsPayload is the first layer of span stats aggregation. It is also
// the payload sent by tracers to the agent when stats in tracer are enabled.
message ClientStatsPayload {
	// Hostname is the tracer hostname. It's extracted from spans with "_dd.hostname" meta
	// or set by tracer stats payload when hostname reporting is enabled.
	string hostname = 1;
	string env = 2; // env tag set on spans or in the tracers, used for aggregation
	string version = 3; // version tag set on spans or in the tracers, used for aggregation
  // @gotags: json:"stats,omitempty" msg:"Stats,omitempty"
	repeated ClientStatsBucket stats = 4;
	string lang = 5; // informative field not used for aggregation
	string tracerVersion = 6; // informative field not used for aggregation
	string runtimeID = 7; // used on stats payloads sent by the tracer to identify uniquely a message
	uint64 sequence = 8; // used on stats payloads sent by the tracer to identify uniquely a message
	// AgentAggregation is set by the agent on tracer payloads modified by the agent aggregation layer
	// characterizes counts only and distributions only payloads
	string agentAggregation = 9;
	// Service is the main service of the tracer.
	// It is part of unified tagging: https://docs.datadoghq.com/getting_started/tagging/unified_service_tagging
	string service = 10;
	// ContainerID specifies the origin container ID. It is meant to be populated by the client and may
	// be enhanced by the agent to ensure it is unique.
	string containerID = 11;
	// Tags specifies a set of tags obtained from the orchestrator (where applicable) using the specified containerID.
	// This field should be left empty by the client. It only applies to some specific environment.
	repeated string tags = 12;
	// The git commit SHA is obtained from a trace, where it may be set through a tracer <-> source code integration.
	string git_commit_sha = 13;
	// The image tag is obtained from a container's set of tags.
	string image_tag = 14;
        // The process tags hash is used as a key for agent stats agregation.
        uint64 process_tags_hash = 15;
        // The process tags contains a list of tags that are specific to the process.
        string process_tags = 16;
}

// ClientStatsBucket is a time bucket containing aggregated stats.
message ClientStatsBucket {
	uint64 start = 1; // bucket start in nanoseconds
	uint64 duration = 2; // bucket duration in nanoseconds
  // @gotags: json:"stats,omitempty" msg:"Stats,omitempty"
	repeated ClientGroupedStats stats = 3;
	// AgentTimeShift is the shift applied by the agent stats aggregator on bucket start
	// when the received bucket start is outside of the agent aggregation window
	int64 agentTimeShift = 4;
}

// Trilean is an expanded boolean type that is meant to differentiate between being unset and false.
enum Trilean {
	NOT_SET = 0;
	TRUE = 1;
	FALSE = 2;
}

enum TraceRootFlag {
	DEPRECATED_NOT_SET = 0;
	DEPRECATED_TRUE = 1;
	DEPRECATED_FALSE = 2;
}

// ClientGroupedStats aggregate stats on spans grouped by service, name, resource, status_code, type
message ClientGroupedStats {
	string service = 1;
	string name = 2;
	string resource = 3;
	uint32 HTTP_status_code = 4;
	string type = 5;
	string DB_type = 6; // db_type might be used in the future to help in the obfuscation step
	uint64 hits = 7; // count of all spans aggregated in the groupedstats
	uint64 errors = 8; // count of error spans aggregated in the groupedstats
	uint64 duration = 9; // total duration in nanoseconds of spans aggregated in the bucket
	bytes okSummary = 10; // ddsketch summary of ok spans latencies encoded in protobuf
	bytes errorSummary = 11; // ddsketch summary of error spans latencies encoded in protobuf
	bool synthetics = 12; // set to true on spans generated by synthetics traffic
	uint64 topLevelHits = 13; // count of top level spans aggregated in the groupedstats
	reserved 14; // peer_service has been deprecated
	string span_kind = 15; // value of the span.kind tag on the span
	// peer_tags are supplementary tags that further describe a peer entity
	// E.g., `grpc.target` to describe the name of a gRPC peer, or `db.hostname` to describe the name of peer DB
	repeated string peer_tags = 16;
	Trilean is_trace_root = 17; // this field's value is equal to span's ParentID == 0.
	string GRPC_status_code = 18;
	string HTTP_method = 19; // HTTP method of the request
	string HTTP_endpoint = 20; // Http route or quantized/simplified URL path
	string service_source = 21; // @inject_tag: msg:"srv_src"
	// used to identify service override origin
	// Deprecated: use additional_metric_tags (field 23) instead.
	repeated string span_derived_primary_tags = 22;
	// additional_metric_tags are tags sent by tracers to be used as additional dimensions for stats aggregation
	repeated string additional_metric_tags = 23;
}