worker: add offline status

[jbrockopp]

Description

For context, we currently deploy our Vela workers with autoscaling configuration enabled so this means our workers will periodically scale up and down throughout the day based off the activity and build volume for our installation. However, this unfortunately leads to some challenges when attempting to leverage the new workers page introduced in the 0.24 release of Vela because the data can become inaccurate and out-of-sync very quickly. We're looking to update the workers page for our installation so it better reflects current state and get closer to near real-time information on it:

There are two main pieces we're looking to update on this page for each record in the workers table:

• the active field being set to false to denote that the worker is no longer active and never will be
• the status field being set to something to denote that the worker is no longer active and never will be

As we were exploring the current enum list available for the status field, we felt there wasn't an ideal one to pick from:

https://github.com/go-vela/types/blob/v0.24.0/constants/worker_status.go

To better state that in words, given the current list I linked above our options are:

• available
• busy
• idle
• error

From our perspective, it seems confusing to have a worker in an idle status that has active as false (no in UI). We'd like to request that a new status be added that we could update workers to and some initial ideas we had were:

• decommissioned
• offline
• shutdown

Value

• enable admins of Vela installations to better reflect the status of workers that will never be available/idle again

Definition of Done

• a new enum has been added to the list of worker statuses that reflects a worker is offline

Effort (Optional)

• unsure at this time

Impacted Personas (Optional)

• admins of a Vela installation

[chrispdriscoll]

We reviewed as a team and felt like your naming ideas were good (no strong opinions otherwise).

Do you plan to submit this change?