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docs: new rpc metric (#12608)

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@ -519,6 +519,52 @@ These metrics are used to monitor the health of the Consul servers.
| `consul.grpc.server.streams` | Measures the number of active gRPC streams handled by the server. | streams | gauge |
| `consul.xds.server.streams` | Measures the number of active xDS streams handled by the server split by protocol version. | streams | gauge |
## Server Workload
** Requirements: **
* Consul 1.12.0+
Label based RPC metrics were added in Consul 1.12.0 as a Beta feature to better understand the workload on a Consul server and, where that workload is coming from. The following metric(s) provide that insight
| Metric | Description | Unit | Type |
| ------------------------------------- | --------------------------------------------------------- | ------ | --------- |
| `consul.rpc.server.call` | Measures the elapsed time taken to complete an RPC call. | ms | summary |
Note that values of the `consul.rpc.server.call` may emit as `0 ms`. That means that the elapsed time < `1 ms`.
### Labels
The the server workload metrics above come with the following labels:
| Label Name | Description | Possible values |
| ------------------------------------- | --------------------------------------------------------- | --------------------------------------- |
| `method` | The name of the RPC method. | The value of any RPC request in Consul. |
| `errored` | Indicates whether the RPC call errored. | `True` or `False`. |
| `request_type` | Whether it is a `read` or `write` request. | `read`, `write` or `unreported`. |
| `rpc_type` | The RPC implementation. | `net/rpc` or `internal`. |
#### Label Explanations
The `internal` value for the `rpc_type` in the table above refers to leader and cluster management RPC operations that Consul performs.
Historically, `internal` RPC operation metrics were accounted under the same metric names.
The `unreported` value for the `request_type` in the table above refers to RPC requests within Consul where it is difficult to ascertain whether a request is `read` or `write` type.
Here is a Prometheus style example of an RPC metric and its labels:
<CodeBlockConfig heading="Sample output of telemetry dump">
```json
...
consul_rpc_server_call{errored="false",method="Catalog.ListNodes",request_type="read",rpc_type="net/rpc",quantile="0.5"} 255
...
```
</CodeBlockConfig>
Any metric in this section can be turned off with the [`prefix_filter`](/docs/agent/options#telemetry-prefix_filter).
## Cluster Health
These metrics give insight into the health of the cluster as a whole.