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I'm getting occasional throughput spikes in my Rails 5 app hosted on Heroku. The spikes are reported in New Relic with the following transaction name: middleware/Rack/ActionDispatch::Routing::RouteSet#call. The spikes result in ~200rmp of those transactions and render the application unresponsive. Restart of the Heroku dyno solves the problem.

What might be causing this behavior? Where should I look?

mrt
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    https://stackoverflow.com/questions/28351527/actiondispatchroutingroutesetcall-rails-4-1-really-slow – max Oct 17 '17 at 11:04

1 Answers1

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On our system we found that Middleware/Rack/ActionDispatch::Routing::RouteSet was mapping to a 404s in NewRelic

Aditya Sanghi
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