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Removing Disqus

I'm removing Disqus from this blog. Disqus allowed readers to post comments on articles. I added it because it was easy to do, but I no longer think it's worth keeping.

If you'd like to share your thoughts, feel free to shoot me an email at harterrt ...

Productivity Systems for Stress Management

Over the years, I've developed a pretty involved productivity system. It was originally based on Getting Things Done, but now it's grown to include the good bits from other systems. It's involved, but I love it.

I get a lot of comments, especially on the little black ...

CLI for alerts via Slack

I finally got a chance to scratch an itch today.


When working with bigger ETL jobs, I frequently run into jobs that take hours to run. I usually either step away from the computer or work on something less important while the job runs. I don't have a ...

Experiments are releases

Mission Control was a major 2017 initiative for the Firefox Data team. The goal is to provide release managers with near-real-time release-health metrics minutes after going public. Will has a great write up here if you want to read more.

The key here is that the data has to be ...

Desirable features of experimentation tools


At Mozilla, we're quickly climbing up our Data Science Hierarchy of Needs 1. I think the next big step for our data team is to make experimentation feel natural. There are a few components to this (e.g. training or culture) but improving the tooling is going to ...

Submission Date vs Activity Date

My comments on Bug 1422892 started to get long, so I started untangling my thoughts here.

From the bug:

We experimented with using activity_date instead of submission_date when developing the clients_daily etl job. We should summarize our findings and decide on which of these measures we'd like to standardize ...

OKRs and 4DX

I feel like I'm swimming in acronyms these days.

Earlier this year, my team started using Objectives and Key Results (OKRs) for our planning. It's been a learning process. I had some prior experience with OKRs at Google, but I've never felt like I was fully taking ...

Evaluating New Tools

At Mozilla, we're still relatively early in our data science journey. As such, we're always evaluating new tools to improve our analysis workflow (jupyter vs. Rmd), or make our infrastructure more usable (our home-rolled ATMO vs. databricks), or scale our knowledge (knoledge-repo. vs. gitbook)

Most of these tools ...

Documentation Style Guide

I just wrote up a style guide for our team's documentation. The documentation is rendered using Gitbook and hosted on Github Pages. You can find the PR here but I figured it's worth sharing here as well.

Style Guide

Articles should be written in Markdown (not AsciiDoc). Markdown ...

Beer and Probes

Quick post to clear up some terminology. But first, an analogy to clear up my thinking:


Temperature control is a big part of brewing beer. Throughout the brewing process I use a thermometer to measure the temperature of the soon-to-be beer. Because I take several temperature readings throughout the ...

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