How to do charm-level tracing
The MAAS region charm supports charm-level tracing out of the box. All you have to do is integrate the MAAS region charm with the Tempo HA charm. This article will show you how.
Prerequisites
You should have a deployed COS Lite bundle with Tempo HA charm on top of it. See this guide for instructions on setting this up.
Integrate MAAS charm with Tempo
Once you have the COS lite model ready, you can quickly integrate Tempo with the MAAS charm.
In the COS lite model, ensure that charmed Tempo is providing an offer over tracing:
juju find-offers
Search for a line that looks like this:
Store URL Access Interfaces
k8s-controller admin/cos.tempo admin tracing:tracing
If you don’t see an offer like that, enable it with the following command:
juju offer tempo:tracing
Now switch to the model where you have charmed MAAS deployed:
juju switch maas-controller:maas-model
Finally, relate the MAAS and Tempo charms over the tracing interface
juju relate maas-region:tracing tempo:tracing
Visualize traces in Grafana
To view the traces of the MAAS region charm:
- Open Grafana in your browser (see here for detailed instructions)
- Go to the
Exploretab - Select the Tempo datasource
- Select the
Searchquery type - Pick
maas-region-charmas the service - Query it!
You should now see a list of traces from the charm. You can inspect them by clicking on a trace ID. Here is a sample screenshot:
