Merge pull request #17 from bsingr/patch-1

Document important docker labels in readme

README.md

@@ -47,6 +47,12 @@ scrape_configs:
       refresh_interval: 10m
 ```
 
+To scrape the containers add following docker labels to them:
+
+* `PROMETHEUS_EXPORTER_PORT` specify the container port where prometheus scrapes (mandatory)
+* `PROMETHEUS_EXPORTER_SERVER_NAME` specify the hostname here, per default ip is used (optional)
+* `PROMETHEUS_EXPORTER_PATH` specify alternative scrape path here (optional)
+
 That's it.  You should begin seeing the program scraping the
 AWS APIs and writing the discovery file (by default it does
 that every minute, and by default Prometheus will reload the