ANN: Metrics in Juju 2.0

[Charles Butler]

This is fantastic Casey!

There's a lot of raw information feeds we can use here directly in Juju. I
like it!

Thanks for sharing this :)

All the best

Charles

On Mon, Oct 3, 2016 at 10:22 AM Casey Marshall <casey.marshall at canonical.com>
wrote:

> I’m pleased to announce Juju Metrics, new in Juju 2.0!
>
> Knowing an application's configuration isn’t enough to effectively operate
> and manage it. Consider that a well-designed application will have as few
> configurable parameters as possible. As an operator, you may find yourself
> wanting to know more about the resources that an application in your model
> consumes and provides -- resources such as:
>
>    -
>
>    Storage GiB used
>    -
>
>    Number of user accounts
>    -
>
>    Number of recently active users
>    -
>
>    Active database connections
>
>
> Juju Metrics complete the operational picture with application
> observability; by modeling, sampling and collecting measurements of
> resources such as these. Juju collects application metrics at a cadence
> appropriate for taking a model-level assessment of application utilization
> and capacity planning. Charm authors and communities can now collaborate on
> figuring out the critical metrics for service assurance and ops, and share
> that through the charms.
>
> There are many instrumentation and time-series data collection solutions
> supporting devops. Juju’s metrics complement these fine-grained,
> lower-level data sources with a model-level overview -- possibly a starting
> point for deeper analysis.
>
> At a glance, operators can pull the most recent measurements across the
> entire model:
>
> $ juju metrics --all
> UNIT                TIMESTAMP               METRIC      VALUE
> auth-sso/0          2016-09-19T22:14:29Z    users       28
> auth-sso/0          2016-09-19T22:14:31Z    tokens      6
> ceph-mon/0          2016-09-19T22:15:36Z    gb-usage    5.2711902345
> webapp/0            2016-09-19T22:17:57Z    requests    11903
> webapp/1            2016-09-19T22:17:52Z    requests    13719
>
> View measurements for specific units or applications:
>
> $ juju metrics webapp/0
> UNIT                TIMESTAMP               METRIC      VALUE
> webapp/0            2016-09-19T22:17:57Z    requests    13719
>
> $ juju metrics sso-auth
> auth-sso/0          2016-09-19T22:14:29Z    users       28
> auth-sso/0          2016-09-19T22:14:31Z    tokens      6
>
> How about adding metrics to a charm? With the reactive framework, it’s
> quick and easy!
>
>
>    1.
>
>    Add layer:metrics to your charm’s layer.yaml
>    2.
>
>    Declare measurements in your charm’s metrics.yaml
>
>
> metrics.yaml declares each metric’s type and the command line that
> measures it. For example, the hypothetical auth-sso charm in the example
> above might declare metrics:
>
> metrics:
>  users:
>    type: gauge
>    description: Number of users
>    command: scripts/count_users.py
>  tokens:
>    type: gauge
>    description: Number of active tokens
>    command: scripts/count_tokens.py
>
> The command lines given in command: attributes above simply need to write
> the current gauge value -- a positive decimal number -- to standard output.
> Juju 2.0 will initially support type: gauge metrics for the operational
> use cases shown above; others such as type: absolute are experimental,
> and will be better supported in Juju 2.1.
>
> I’d like to encourage you to kick the tires on this new feature, and let’s
> start measuring things in our charms!
>
> For more information, here are links to documentation:
>
> Metrics, User Guide: https://jujucharms.com/docs/stable/charms-metrics
>
> Metrics, Developer Guide:
> https://jujucharms.com/docs/stable/developer-metrics
>
> -Casey
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Juju Charmer
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