syntax = "proto3";

import "google/protobuf/timestamp.proto";

package event.proto;

message Metadata {
  string name = 1;
  enum MetricType {
    COUNTER = 0;
    GAUGE = 1;
    HISTOGRAM = 2;
  }
  MetricType metric_type = 2;
  oneof unit {
    string unit_value = 3;
  }
  oneof description {
    string description_value = 4;
  }
}

message Metric {
  string name = 1;
  google.protobuf.Timestamp timestamp = 2;
  map<string, string> labels = 3;
  oneof operation {
    uint64 increment_counter = 4;
    uint64 set_counter = 5;
    double increment_gauge = 6;
    double decrement_gauge = 7;
    double set_gauge = 8;
    double record_histogram = 9;
  }
}

message Event {
  oneof event {
    Metadata metadata = 1;
    Metric metric = 2;
  }
}