Update protos to 0.18.0 (#3321)

Co-authored-by: Cijo Thomas <[email protected]>

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/Implementation/opentelemetry/proto/collector/README.md

@@ -7,3 +7,4 @@ This package describes the OpenTelemetry collector protocol.
 1. `common` package contains the common messages shared between different services.
 2. `trace` package contains the Trace Service protos.
 3. `metrics` package contains the Metrics Service protos.
+4. `logs` package contains the Logs Service protos.

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/Implementation/opentelemetry/proto/collector/logs/v1/logs_service.proto

@@ -14,9 +14,6 @@
 
 syntax = "proto3";
 
-// NOTE: This proto is experimental and is subject to change at this point.
-// Please do not use it at the moment.
-
 package opentelemetry.proto.collector.logs.v1;
 
 import "opentelemetry/proto/logs/v1/logs.proto";

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/Implementation/opentelemetry/proto/metrics/v1/metrics.proto

@@ -492,6 +492,12 @@ message HistogramDataPoint {
   // Flags that apply to this specific data point.  See DataPointFlags
   // for the available flags and their meaning.
   uint32 flags = 10;
+
+  // min is the minimum value over (start_time, end_time].
+  optional double min = 11;
+
+  // max is the maximum value over (start_time, end_time].
+  optional double max = 12;
 }
 
 // ExponentialHistogramDataPoint is a single data point in a timeseries that describes the
@@ -532,7 +538,7 @@ message ExponentialHistogramDataPoint {
   // Negative events *can* be recorded, but sum should not be filled out when
   // doing so.  This is specifically to enforce compatibility w/ OpenMetrics,
   // see: https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#histogram
-  double sum = 5;
+  optional double sum = 5;
 
   // scale describes the resolution of the histogram.  Boundaries are
   // located at powers of the base, where:
@@ -594,6 +600,12 @@ message ExponentialHistogramDataPoint {
   // (Optional) List of exemplars collected from
   // measurements that were used to form the data point
   repeated Exemplar exemplars = 11;
+
+  // min is the minimum value over (start_time, end_time].
+  optional double min = 12;
+
+  // max is the maximum value over (start_time, end_time].
+  optional double max = 13;
 }
 
 // SummaryDataPoint is a single data point in a timeseries that describes the