Bump new proto version

output/cloud/expv2/pbcloud/metric.proto

@@ -2,22 +2,25 @@ syntax = "proto3";
 
 package metrics;
 
-option go_package = "go.k6.io/k6/otput/cloud/expv2/pbcloud";
+option go_package = "go.k6.io/k6/output/cloud/expv2/pbcloud";
 
 import "google/protobuf/timestamp.proto";
 
 // The type of a Metric.
 enum MetricType {
-  METRICTYPE_UNSPECIFIED = 0;
-  COUNTER = 1;
-  GAUGE = 2;
-  RATE = 3;
-  TREND = 4;
+  // Metric of type METRICTYPE_UNSPECIFIED declared, but not allowed.
+  // See: https://protobuf.dev/programming-guides/dos-donts/#do-include-an-unspecified-value-in-an-enum.
+  METRIC_TYPE_UNSPECIFIED = 0;
+  METRIC_TYPE_COUNTER = 1;
+  METRIC_TYPE_GAUGE = 2;
+  METRIC_TYPE_RATE = 3;
+  METRIC_TYPE_TREND = 4;
 }
 
 // MetricSet is the top-level container type
 // that is encoded and sent over the wire.
 message MetricSet {
+  // Required.
   repeated Metric metrics = 1;
 }
 
@@ -26,6 +29,7 @@ message Metric {
   string name = 1;
 
   // Required.
+  // Can't be of type MetricType.METRICTYPE_UNSPECIFIED (which is zero value).
   MetricType type = 2;
 
   // Optional.
@@ -43,11 +47,17 @@ message Label {
 
 // TimeSeries is a single metric with a unique set of labels..
 message TimeSeries {
+  // Required.
+  //
+  // At minimum two labels should be present:
+  // - name: "__name__", value: "metric name this time series belongs to/is contained within",
+  // - name: "test_run_id", value: "cloud test run ID this time series belongs to".
   repeated Label labels = 1;
 
   // time bucket size in seconds
   uint32 aggregation_period = 2;
 
+  // Required.
   oneof samples {
     CounterSamples counter_samples = 3;
     GaugeSamples gauge_samples = 4;
@@ -57,27 +67,34 @@ message TimeSeries {
 }
 
 message CounterSamples {
+  // Required.
   repeated CounterValue values = 1;
 }
 
 message GaugeSamples {
+  // Required.
   repeated GaugeValue values = 1;
 }
 
 message RateSamples {
+  // Required.
   repeated RateValue values = 1;
 }
 
 message TrendHdrSamples {
+  // Required.
   repeated TrendHdrValue values = 1;
 }
 
 message CounterValue {
+  // Required.
   google.protobuf.Timestamp time = 1;
+
   double value = 2;
 }
 
 message GaugeValue {
+  // Required.
   google.protobuf.Timestamp time = 1;
 
   // last observed value
@@ -91,12 +108,15 @@ message GaugeValue {
 }
 
 message RateValue {
+  // Required.
   google.protobuf.Timestamp time = 1;
+
   uint32 nonzero_count = 2;
   uint32 total_count = 3;
 }
 
 message TrendHdrValue {
+  // Required.
   google.protobuf.Timestamp time = 1;
 
   // histogram parameter - value multiplier aka smallest value, default = 1.0