[RFE] Better metrics & monitoring

[bdunne]

It would be nice to get some automated notifications happening:

• when nothing is happening (queue work is not being processed)
• when there are unexpected errors
• some graphs showing number of processed tasks over time would also be nice
• maybe writing to the gitter room too if there's a problem

[NickLaMuro]

@bdunne I was thinking that this would be something that would be good for the chat bot feature that I POC'd a few months ago:

#452

Having a @miq-bot status command might not be a bad idea, assuming the metrics were made public facing, but it would avoid the need for having to ping you or Jason when something seems fishy with the bot.

[miq-bot]

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