readme

README.md

@@ -2,12 +2,22 @@
 
 Various tools to monitor Docker containers
 
+## Services
+
+### [Telegraf](https://www.influxdata.com/time-series-platform/telegraf/) - [Docker plugin](https://github.com/influxdata/telegraf/blob/master/plugins/inputs/docker/README.md)
+
+> Telegraf is the open source server agent to help you collect metrics from your stacks, sensors, and systems.
+
+### Grafana [Promtail](https://grafana.com/docs/loki/latest/send-data/promtail/)
+
+> Promtail is an agent which ships the contents of local logs to a private Grafana Loki instance or Grafana Cloud. It is usually deployed to every machine that runs applications which need to be monitored.
+
 ## Environment Variables
 
 - `DOCKER_INFLUXDB_INIT_ORG`
 - `INFLUX_WRITE_TOKEN`
-- `INFLUX_HOST`
-- `LOKI_HOST`
+- `INFLUX_HOST` (optional)
+- `LOKI_HOST` (optional)
 
 ## Setup