Improve readability of some dashboards

[ggouzi]

Bug Description

For some dashboards, graphs show several lines, all matching a metric and a unit. However, the unit name is never displayed.

In some cases, a user would potentially need to investigate why one line is way above the others (in case one unit is reporting a high delay/latency/offset for example).
However, it is not easy to understand which line/color represents which unit.
Would it be possible to adjust the dashboards to improve readability ?

Suggestion:

(although it can become difficult to read if there are dozens of different units to display)

To Reproduce

Assuming another cos model already runs

juju consume cos.grafana
juju consume cos.prometheus
juju consume cos.loki

juju deploy ubuntu --series=24.04
juju deploy chrony-client --channel=latest/edge --series=noble
juju deploy grafana-agent --channel=2/stable --series=noble

juju relate grafana-agent grafana
juju relate grafana-agent prometheus
juju relate grafana-agent loki
juju relate grafana-agent chrony-client
juju relate chrony-client ubuntu

Environment

• chrony-client latest/edge rev 28
• juju client/agent: 3.6.12
• OS 24.04
• grafana-agent 2/stable

Relevant log output

N/A

Additional context

No response

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The internal ticket has been created: https://warthogs.atlassian.net/browse/ISD-5089.

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