PoC iss-telemetry-exporter

[Kariton]

This is a PoC of my iss-telemetry Prometheus exporter.

Prometheus is an open-source monitoring and alerting toolkit.
It collects metrics from various sources, stores them,
and allows users to query and visualize the data for troubleshooting and analysis.

And Grafana is such a virtualisation tool.

The iss-telemetry-exporter exposes the lightstreamer metrics in a format that Prometheus can work with.
Grafana can visualize those in a lot of different ways.
Additionally i collect the current position of the ISS from open-notify.

The currently included dashboard is just a example. And less then minimalistic.

Due to the nature of the lightstreamer data the exporter can only export metrics it has seen at least once.
Until the next change happens it will continue to expose the last value. (not really the right way...)

This means that a lot of dashboards might show "No Data" or i might have missed a few metrics in my example dashboard.
If the exporter would not export the last value - instead of all "current" values - some dashboards would only have one datapoint or even nothing to show in a time range. Because this is not useful i decided to hold onto them.

But it might be possible to fetch all last values on startup. I currently just don't know how.

The example dashboard is generated with autograf, a tool to... autograf.
I only fixed some minor issues and added the Geomap which plots the ISS path across the globe.

@ISS-Mimic

[Kariton]

The used mem* and cpu limits defined in docker-compose.yml are just copied from my "bigger" setup.
it will work with less resources. but i dont know how low they can be.

it will definitely work on a RPi or something like this.