Add gRPC metrics to Metrics reference list

[wtlucy]

Related to #2698

New metrics have been added for the grpc-1.0 and grpcClient-1.0 features. Those metrics need to be added to https://openliberty.io/docs/20.0.0.10/metrics-list.html#

• grpc-1.0 metrics

grpc.server.rpcStarted.total{grpc=<service_name>}  vendor_grpc_client_rpcStarted_total  Counter  The total number of RPCs started on the server.  mpMetrics-2.3
grpc.server.rpcCompleted.total{grpc=<service_name>}   vendor_grpc_server_rpcCompleted_total  Counter  The total number of RPCs completed on the server, regardless of success or failure.  mpMetrics-2.3
grpc.server.sentMessages.total{grpc=<service_name>}  vendor_grpc_server_sentMessages_total  Counter  The total number of stream messages sent by the server.  mpMetrics-2.3
grpc.server.receivedMessages.total{grpc=<service_name>}  vendor_grpc_server_receivedMessages_total  Counter  The total number of stream messages received from the client.  mpMetrics-2.3
grpc.server.responseTime.total{grpc=<service_name>}  vendor_grpc_server_responseTime_total_seconds  Gauge  The total response time of completed RPCs.  mpMetrics-2.3

• grpcClient-1.0 metrics

grpc.client.rpcStarted.total{grpc=<method_name>}  vendor_grpc_client_rpcStarted_total  Counter  The total number of RPCs started on the client.  mpMetrics-2.3
grpc.client.rpcCompleted.total{grpc=<method_name>}  vendor_grpc_client_rpcCompleted_total  Counter  The total number of RPCs completed on the client, regardless of success or failure.  mpMetrics-2.3
grpc.client.sentMessages.total{grpc=<method_name>}  vendor_grpc_client_sentMessages_total  Counter  The total number of stream messages sent by the client.  mpMetrics-2.3
grpc.client.receivedMessages.total{grpc=<method_name>}  vendor_grpc_client_receivedMessages_total  Counter  The total number of stream messages received from the server.  mpMetrics-2.3
grpc.client.responseTime.total{grpc=<method_name>}  vendor_grpc_client_responseTime_total_seconds  Gauge  The total response time of completed RPCs.  mpMetrics-2.3

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Additionally, we need to add the corresponding metrics to the JMX metrics catalog doc that's being created in #1286; for that doc, we'll need to add sections like

GrpcServerStats MXBean

You can use the GrpcServerStats MXBean for monitoring gRPC services. Performance data is available for each service.
The following attributes are abailable for the GrpcServerStats MXBean. The object name of the MXBean for these attributes is `WebSphere:type=GrpcServerStats,name=*":

• The gRPC service name ServiceName N/A
• The Application Name AppName N/A
• Started RPC count RpcStartedCount N/A
• Completed RPC count RpcCompletedCount N/A
• Sent Message Count SentMessagesCount N/A
• Received Message Count ReceivedMessagesCount N/A
• Average Response Time ResponseTime Milliseconds

and

GrpcClientStats MXBean

You can use the GrpcServerStats MXBean for monitoring gRPC services. Performance data is available for each RPC.
The following attributes are abailable for the GrpcClientStats MXBean. The object name of the MXBean for these attributes is `WebSphere:type=GrpcClientStats,name=*":

• The gRPC service name ServiceName N/A
• Started RPC count RpcStartedCount N/A
• Completed RPC count RpcCompletedCount N/A
• Sent Message Count SentMessagesCount N/A
• Received Message Count ReceivedMessagesCount N/A
• Average Response Time ResponseTime Milliseconds

[Charlotte-Holt]

@wtlucy I made these updates in the following docs:

• https://draft-openlibertyio.mybluemix.net/docs/20.0.0.12/metrics-list.html
• https://draft-openlibertyio.mybluemix.net/docs/20.0.0.12/jmx-metrics-list.html

Please review the updates and let me know if any updates are required, thx!

[wtlucy]

The doc updates looks good to me - thanks!

[Charlotte-Holt]

The update to metrics-list.adoc was merged to vNext in #3080. The updates to jmx-metrics-list.adoc will be published when the topic is published in 20.0.0.12.