Disable the Heka dashboard plugin
Disable the Heka dashboard plugin

I don't think we need the dashboard plugin, given that:

 - it's not reliable if Heka gets stuck (see quote below)
 - it relies on us port-forwarding via SSH, which isn't great
 - it might even be the source of the memory leak (though I have no
   reason to believe that currently, it'd be good to discount it)

We can retrieve much of the same statistics provided by the Heka
dashboard by sending a `SIGUSR1` signal to the `hekad` process, e.g.:

    sudo kill -SIGUSR1 $(pgrep hekad)

See:
https://hekad.readthedocs.org/en/latest/monitoring/index.html

The dashboard statistics may not be reliable:

> It's worth noting that after Heka is wedged you can no longer trust
> the HTTP dashboard, since it actually uses Heka's message routing
> mechanism to receive the information that its showing. If messages
> aren't flowing, the dashboard won't be updated.

https:446c51d08c8f2228766ec548df66e1a01dfb7b66@mozilla.org/msg00208.html

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