Use caution when using $rate_interval along with increase()
A few months ago, I was pairing with my coworker Graham on a Grafana dashboard, and we ran into a pitfall I thought it'd be nice to share. We were trying to create a dashboard that would show how many changes happened to a database table between points on the graph, and we were getting some mysterious results!
Read More...Posted on 2024-02-28
With SQLite, INSERT OR IGNORE Is Often Not What You Want
tl;dr - INSERT OR IGNORE will silently fail if any constraint is violated (even a NOT NULL on a column type!). If you want to express "insert this row unless it already exists", use ON CONFLICT instead.
Posted on 2024-02-04
Which fields can you use with Kubernetes field selectors?
Field selectors are a handy filter you can provide kubectl get via the --field-selector option to pare down the list of resources you get back from the server. The docs mention that supported fields vary from resource to resource, but sadly don't mention which resources support which fields. I did a little bit of poking around, and - as far as I can tell - this isn't documented anywhere! So, seeing as reading source code is one of my Maslow's hammers, I broke out that particular hammer and got to reading.
Posted on 2022-01-24
Follow-up on spurious wakeups
So, the fix I implemented for my wakeup problem a few weeks ago had an interesting side effect. Normally, when I put my laptop to sleep, it loses about 10% of its charge per day, which seems reasonable. After my fix, however, it started to lose 40% per day - it's not uncommon for me not to touch my laptop for a few days, so that's not great. So here's a follow-up on how I addressed that issue!
Read More...Posted on 2022-01-12
Avoiding spurious wakeups with my ThinkPad X1 Yoga
Last year I bought myself a ThinkPad X1 Yoga to use as my personal laptop - I've been pretty happy with it so far, but there's one problem I've run into that I've noticed a lot more lately - the laptop will sometimes wake up while the lid is closed, go back to sleep, and then repeat that whole process every few minutes. This can't be good for the hardware, so I dug into this issue and wanted to share my findings with anyone who's having the same problem running Linux on this laptop!
Read More...Posted on 2022-01-01
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