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Monitoring Monitoring Systems at Roy Rapoport - @royrapoport May 22, 2017

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The Hero’s Journey

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An ordinary person A software engineer

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Receives a call Lets build a monitoring system!

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is dubious These specs are silly and you’re silly

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is persuaded nonetheless Sure, I’d love to learn Scala!

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vanquishes enemies Product Managers Engineering Managers Opinionated Coworkers

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undergoes the ordeal Damn, this won’t scale. Also, we probably shouldn’t have coded a JS interpreter in Erlang.

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returns, successful and transformed This will scale for at least a month. Ship it!

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The Beginning

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Real-Time Operational Insight

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Monitoring ain’t Alerting

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Alerting

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Alert Action Server Stream Processing Atlas SQS Hot Checker Cold Checker AWS Email Page …

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Monitoring

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Preamble

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6H 3D 18D Publish MR Query S3 Anatomy of an Atlas Deployment Group (ADG) m etrics

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Server Proxy us-west-2 Server Proxy us-east-1 eu-west-1 Server Proxy

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Server Proxy us-west-2 Server Proxy us-east-1 eu-west-1 Server Proxy ADG ADG

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Server Proxy us-west-2 Server Proxy us-east-1 eu-west-1 Server Proxy ADG ADG iep ADG
 iep ADG
 iep ADG


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Server Proxy us-west-2 Server Proxy us-east-1 eu-west-1 Server Proxy ADG ADG iep ADG
 iep ADG
 iep ADG
 Critical Critical Critical

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Tradeoffs: Fail loud Lower TTD

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“This morning around 0504 US/Pacific, the active primary region hosting Atlas metrics data began experiencing issues and a number of alerts were triggered across the board.“ February 9, 2017

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Managing Cost

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Cost Doesn’t Matter

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“Everything Counts in Large Amounts”

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“Everything Counts in Large Amounts” - Depeche Mode

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Cardinal Sins

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What’s a Metric? • name = cpu • nf.region = us-east-1 • nf.zone = us-east-1a • nf.app = api • nf.cluster = api-main • nf.asg = api-main-v103 • nf.node = i-103efbdd • device.operationalName = roku • isSupplementalVideo = false • OnComplete = operation • …

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OOPS

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Fun Metric Dimensions
 A True Story • IP address (~ 232) • Account ID (~109) • Customer ID (~109) • Execution time, ms (~30K)

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“The graph on the wall tells the story of it all” - Depeche Mode

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What are you (not) talking about?

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The latest thing

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Meet Swaroop

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The End

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The Beginning

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?

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Attributions • https://www.flickr.com/photos/kalleboo/2240042641/ • http://imgur.com/gallery/QCrR73q • https://www.flickr.com/photos/35028096@N04/6119259650 • https://www.flickr.com/photos/86639298@N02/9420223184 • http://paristext2015.com/2015/06/1-5-degrees-celsius-or-2-degrees-maybe-its-turtles-all- the-way-down/ • https://www.flickr.com/photos/60969081@N00/8292545493 • By Photo courtesy of National Nuclear Security Administration / Nevada Site Office - This image is available from the National Nuclear Security Administration Nevada Site Office Photo Library under number XX-34.This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required., Public Domain, https:// commons.wikimedia.org/w/index.php?curid=190949 • http://www.animal-space.net/2010/12/16-funny-pictures-of-shocked-cats.html • https://www.flickr.com/photos/10459174@N03/34563622796/