Set up [pagerduty] alerts for important metrics

[patcon]

Explore and configure more granular alerting to notify on issues like the recent server congestion one (#2109).

Questions

• which metrics?

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[grampajoe]

Which metrics are available? Is there a resource anywhere describing Gittip's infrastructure?

[chadwhitacre]

Is there a resource anywhere describing Gittip's infrastructure?

There's barely a start at http://building.gittip.com/hackers/sa/.

[seanlinsley]

We currently use Librato to build a visual dashboard of application performance. As far as Gittip's infrastructure, it's pretty simple: we're running on a single instance on Heroku.

[nobodxbodon]

Pagerduty isn't used after review fixed cost