Add support for local metric collection/viewing (#4170)

metrics/scripts/README.md

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+
+This directory contains scripts to manage a local instance of [InfluxDB OSS](https://docs.influxdata.com/influxdb/v1.5/) and [Grafana](https://grafana.com/docs/v5.2/)
+
+### Setup
+
+Start the local metric services:
+
+`$ ./start.sh`
+
+Metrics are enabled on a per-shell basis which means you must `source` the following scripts in each shell in which you start an application you wish to collect metrics from.  For example, if running a Solana fullnode you must call `source ./enable.sh` before starting the node.
+
+`$ source ./enable.sh`
+
+Once metrics have been started and you have an application running you can view the metrics at:
+
+http://localhost:3000/d/local/local-monitor
+
+Stop metric services:
+
+`$ ./stop.sh`
+
+### InfluxDB CLI
+
+You may find it useful to install the InfluxDB client for
+adhoc metrics collection/viewing
+* Linux - `sudo apt-get install influxdb-client`
+* macOS - `brew install influxdb`
+
+
+Simple example of pulling all `thinclient` measurements out
+of the `local` database:
+```sh
+$ influx -database local -username admin -password admin -execute 'select * from thinclient'
+```
+
+Reference: https://docs.influxdata.com/influxdb/v1.5/query_language/
+
+### Monitoring
+
+To monitor activity, run one of:
+
+```
+$ docker logs -f influxdb
+$ docker logs -f grafana
+```
+
+### Reference
+* https://hub.docker.com/_/influxdata-influxdb
+* https://hub.docker.com/r/grafana/grafana