datasource empty in telegraf dashboard

[Yoshi Kadokawa]

The telegraf dashboards in Grafana, both host and application, shows the following error as shown in the screenshot attached.

Templating
Failed to upgrade legacy queries Datasource - Juju generated source was not found
Templating [host|apps]
Error updating options: Datasource - Juju generated source was not found

This is reproduced with the following bundle.

series: focal
applications:
  prometheus:
    charm: prometheus2
    num_units: 1
  grafana:
    charm: grafana
    num_units: 1
  telegraf:
    charm: telegraf
relations:
  - [ "prometheus:grafana-source", "grafana:grafana-source" ]
  - [ "prometheus:target", "telegraf:prometheus-client" ]
  - [ "grafana:dashboards", "telegraf:dashboards" ]
  - [ "grafana:juju-info", "telegraf:juju-info" ]
  - [ "prometheus:juju-info", "telegraf:juju-info" ]

As the error state, it looks like the datasource is empty in the dashboard json configuration.
I could mitigate the issue by running the following

juju config telegraf prometheus_datasource="prometheus"

[Yoshi Kadokawa (yoshikadokawa)]

Adding juju-crashdump

[Tianqi Xiao (txiao)]

MP#422773 [1] has fixed this issue. The revision (51) with this MP got published to the latest/edge channel in Charmhub.

[1]: https://code.launchpad.net/~txiao/charm-telegraf/+git/charm-telegraf/+merge/422773

[Nobuto Murata (nobuto)]

Subscribing ~field-high. Since the fix is not released to the latest/stable channel yet. The bug status should be more of Fix Committed instead of Fix Released in this case.

$ juju info telegraf
name: telegraf

channels: |
  latest/stable: cc7fa21 2022-04-28 (49) 10MB
  latest/candidate: cc7fa21 2022-04-21 (49) 10MB
  latest/beta: ↑
  latest/edge: 1fa6420 2022-07-25 (52) 10MB