syntax = "proto3";

package logproto;

import "gogoproto/gogo.proto";
import "pkg/logproto/logproto.proto";

option go_package = "github.com/grafana/loki/v3/pkg/logproto";
option (gogoproto.marshaler_all) = true;
option (gogoproto.unmarshaler_all) = true;

message WriteRequest {
  repeated TimeSeries timeseries = 1 [
    (gogoproto.nullable) = false,
    (gogoproto.customtype) = "PreallocTimeseries"
  ];
  enum SourceEnum {
    API = 0;
    RULE = 1;
  }
  SourceEnum Source = 2;
  repeated MetricMetadata metadata = 3 [(gogoproto.nullable) = true];

  bool skip_label_name_validation = 1000; //set intentionally high to keep WriteRequest compatible with upstream Prometheus
}

message WriteResponse {}

message TimeSeries {
  repeated LegacyLabelPair labels = 1 [
    (gogoproto.nullable) = false,
    (gogoproto.customtype) = "LabelAdapter"
  ];
  // Sorted by time, oldest sample first.
  repeated LegacySample samples = 2 [(gogoproto.nullable) = false];
  // repeated Exemplar exemplars = 3 [(gogoproto.nullable) = false];
}

message MetricMetadata {
  enum MetricType {
    UNKNOWN = 0;
    COUNTER = 1;
    GAUGE = 2;
    HISTOGRAM = 3;
    GAUGEHISTOGRAM = 4;
    SUMMARY = 5;
    INFO = 6;
    STATESET = 7;
  }

  MetricType type = 1;
  string metric_family_name = 2;
  string help = 4;
  string unit = 5;
}

message Metric {
  repeated LegacyLabelPair labels = 1 [
    (gogoproto.nullable) = false,
    (gogoproto.customtype) = "LabelAdapter"
  ];
}