Grandchild jobs in the Nomad UI

[gulducat]

As pointed out in #24311, currently children of child jobs (I'll say grandchildren of grandparent jobs) are not easy to browse to in the Nomad web UI.

We brushed up against this when revamping the Jobs page (lil breadcrumb in rpc code), but I don't think we wrote it down anywhere to eventually swing back around to it.

CLI

grandparent.nomad.hcl:

# `nomad job run` produces a parameterized job
job "grandparent" {
  type = "batch"

  # `nomad job dispatch grandparent` produces a child job
  parameterized {}

  # `nomad job periodic force grandparent/`
  # of the child produces a periodic child,
  # i.e. a "grandchild" job of the original "grandparent"
  periodic {
    crons = ["30 2 * * * *"] # 2:30am daily, e.g.
  }

  group "example" {
    task "example" {
      driver = "docker"
      config {
        image   = "busybox:1"
        command = "sh"
        args    = ["-c", "echo hello; sleep 1"]
      }
    }
  }
}

$ nomad run grandparent.nomad.hcl
Job registration successful
$ nomad job dispatch grandparent
Dispatched Job ID = grandparent/dispatch-1730309121-2f3cdded
$ nomad job periodic force grandparent/
==> 2024-10-30T13:25:32-04:00: Monitoring evaluation "7e7eb01d"
    2024-10-30T13:25:32-04:00: Evaluation triggered by job "grandparent/dispatch-1730309121-2f3cdded/periodic-1730309132"
    2024-10-30T13:25:33-04:00: Allocation "c7540d85" created: node "4d4717d0", group "example"
    2024-10-30T13:25:33-04:00: Evaluation status changed: "pending" -> "complete"
==> 2024-10-30T13:25:33-04:00: Evaluation "7e7eb01d" finished with status "complete"
$ nomad status
ID                                                            Type                          Priority  Status   Submit Date
grandparent                                                   batch/periodic/parameterized  50        running  2024-10-30T13:25:17-04:00
grandparent/dispatch-1730309121-2f3cdded                      batch/periodic                50        running  2024-10-30T13:25:21-04:00
grandparent/dispatch-1730309121-2f3cdded/periodic-1730309132  batch                         50        dead     2024-10-30T13:25:32-04:00

Web UI

The grandchild is not browse-to-able through Jobs

Only through Evaluations (or generating the URL manually)