Articles By Zachary Tong

22 December 2016 Engineering

A Profile a Day Keeps the Doctor Away: The Elasticsearch Search Profiler

By Zachary Tong

Back in the dark ages of Elasticsearch, understanding why a query was slow required experience, intuition, reading some tea leaves and making sure the moon was

16 December 2015 Engineering

Implementing a Statistical Anomaly Detector in Elasticsearch - Part 3

By Zachary Tong

In the final article of this three-part series, we build a fully automated anomaly detector using Watcher to send email alerts.

02 December 2015 Engineering

Implementing a statistical anomaly detector in Elasticsearch - Part 2

By Zachary Tong

In part 2 of this series on building a statistical anomaly detector, we graph the output in Timelion, a Kibana app for graphing time-series data.

23 November 2015 Engineering

Implementing a Statistical Anomaly Detector in Elasticsearch - Part 1

By Zachary Tong

In this series, we implement a statistical anomaly detector to detect when correlated changes in variance occur, providing forewarning of a disruption.

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12 August 2015 Engineering

Staying in Control with Moving Averages - Part 2

By Zachary Tong

In Part 2, the Control Chart is used in tricky scenarios such as constantly increasing linear trends or cyclic/seasonal data.