metrics: Initial commit

Adds .gitignore, BSD license and README.md

Signed-off-by: Dimitri Staessens <[email protected]>

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+# Ouroboros metrics
+
+A collection of observability tools for exporting and
+visualising metrics collected from Ouroboros.
+
+Currently has one very simple exporter for InfluxDB, and provides
+additional visualization via grafana.
+
+More features will be added over time.
+
+## Requirements:
+
+InfluxDB 0SS 2.0, https://docs.influxdata.com/influxdb/v2.0/
+
+python influxdb-client, install via
+
+```
+pip install 'influxdb-client[ciso]'
+```
+
+## Optional requirements:
+
+Grafana, https://grafana.com/
+
+## Setup
+
+Install and run InfluxDB and create a bucket in influxDB for exporting
+Ouroboros metrics, and a token for writing to that bucket. Consult the
+InfluxDB documentation on how to do this,
+https://docs.influxdata.com/influxdb/v2.0/get-started/#set-up-influxdb.
+
+To use grafana, install and run grafana open source,
+https://grafana.com/grafana/download
+https://grafana.com/docs/grafana/latest/?pg=graf-resources&plcmt=get-started
+
+Go to the grafana UI (usually http://localhost:3000) and set up
+InfluxDB as your datasource:
+Go to Configuration -> Datasources -> Add datasource and select InfluxDB
+Set "flux" as the Query Language, and
+under "InfluxDB Details" set your Organization as in InfluxDB and set
+the copy/paste the token for the bucket to the Token field.
+
+To add the Ouroboros dashboard,
+select Dashboards -> Manage -> Import
+
+and then either upload the json file from this repository in
+
+dashboards-grafana/general.json
+
+or copy the contents of that file to the "Import via panel json"
+textbox and click "Load".
+
+## Run the exporter:
+
+Clone this repository and go to the pyExporter directory.
+
+Edit the config.ini.example file and fill out the InfluxDB
+information (token, org). Save it as config.ini.
+
+and run oexport.py
+
+```
+cd exporters-influxdb/pyExporter/
+python oexport.py
+```