Add LibraryInfo and plugin into the collector

Signed-off-by: Bogdan Drutu <bogdandrutu@gmail.com>

opentelemetry/proto/collector/metrics/v1/metrics_service.proto

@@ -34,25 +34,34 @@ service MetricsService {
 }
 
 message ExportMetricsServiceRequest {
-  // Metric data. An array of ResourceMetrics.
+  // An array of ResourceMetrics.
   // For data coming from a single resource this array will typically contain one
   // element. Intermediary nodes (such as OpenTelemetry Collector) that receive
   // data from multiple origins typically batch the data before forwarding further and
   // in that case this array will contain multiple elements.
   repeated ResourceMetrics resource_metrics = 1;
 }
 
-// A collection of metrics from a Resource.
+// A collection of LibraryMetrics from a Resource.
 message ResourceMetrics {
   // A list of metrics that originate from a resource.
-  repeated opentelemetry.proto.metrics.v1.Metric metrics = 1;
+  repeated LibraryMetrics library_metrics = 1;
 
-  // The resource for the metrics in this message that do not have an explicit
-  // Metric.resource field set. If neither this field nor Metric.resource are set then no
-  // resource info is known.
+  // The resource for the metrics in this message.
+  // If this field is not set then no resource info is known.
   opentelemetry.proto.resource.v1.Resource resource = 2;
 }
 
+// A collection of Metrics from a LibraryInfo.
+message LibraryMetrics {
+  // A list of metrics that originate from a library.
+  repeated opentelemetry.proto.metrics.v1.Metric metrics = 1;
+
+  // The library information for the metrics in this message.
+  // If this field is not set then no library info is known.
+  opentelemetry.proto.common.v1.LibraryInfo library_info = 2;
+}
+
 
 message ExportMetricsServiceResponse {
 }

opentelemetry/proto/collector/trace/v1/trace_service.proto

@@ -37,23 +37,33 @@ service TraceService {
 }
 
 message ExportTraceServiceRequest {
-  // Span data. An array of ResourceSpans.
+  // An array of ResourceSpans.
   // For data coming from a single resource this array will typically contain one
   // element. Intermediary nodes (such as OpenTelemetry Collector) that receive
   // data from multiple origins typically batch the data before forwarding further and
   // in that case this array will contain multiple elements.
   repeated ResourceSpans resource_spans = 1;
 }
 
-// A collection of spans from a Resource.
+// A collection of LibrarySpans from a Resource.
 message ResourceSpans {
-  // A list of Spans that originate from a resource.
+  // A list of LibrarySpans that originate from a resource.
   repeated opentelemetry.proto.trace.v1.Span spans = 1;
 
   // The resource for the spans in this message.
   // If this field is not set then no resource info is known.
   opentelemetry.proto.resource.v1.Resource resource = 2;
 }
 
+// A collection of Spans from a LibraryInfo.
+message LibrarySpans {
+  // A list of Spans that originate from a library.
+  repeated opentelemetry.proto.trace.v1.Span spans = 1;
+
+  // The library information for the metrics in this message.
+  // If this field is not set then no library info is known.
+  opentelemetry.proto.common.v1.LibraryInfo library_info = 2;
+}
+
 message ExportTraceServiceResponse {
 }

opentelemetry/proto/common/v1/common.proto

@@ -53,3 +53,10 @@ message StringKeyValue {
   string key = 1;
   string value = 2;
 }
+
+// LibraryInfo is a message representing the instrumented library informations such as the fully
+// qualified name and version. 
+message LibraryInfo {
+  string name = 1;
+  string version = 2;
+}