Have you ever looked at someone else’s Honeycomb query and thought “what’s up with ‘trace.parent_id does not exist’? Or wondered how Honeycomb’s home screen counts Total Requests? This is totally confusing. Here, I made a video about how to do it and why it works like that.
People can “learn to code” on so many websites, in little in-browser environments. Sites instruct on the basics of ‘for’ loops and ‘if’ statements. In advanced courses, learn algorithms and data structures. Writing toy programs is eminently teachable. Writing useful programs is something else. And writing them well is a mysterious art. Greg Wilson‘s new …
Why is this so hard? To send gRPC messages in Rust, one uses the tonic library. If you’re sending to an https endpoint, you’ll need to provide a ClientTlsConfig. By default, you’ll get a very distrustful one. Here’s the error message: the grpc server returns error (The service is currently unavailable): , detailed error message: …
Read moreMake https work on gRPC in Rust: load a root certificate into the TLS config
TL;DR: Run the OpenTelemetry Collector helm chart with –values=values.yaml pointing to the values.yaml in this gist. Use kubectl get services to find the collector’s URL. The rest of this blog post walks through the whole process of setting this up. This will teach you the why and how of each step, so that you can adjust it to your needs. There’s also …
Read moreRun the OpenTelemetry Collector in Kubernetes for Front-End Tracing
TL;DR: startSpan is easier and measures a duration. Use it if your work won’t create any subspans. startActiveSpan requires that you pass a callback for the work in the span, and then any spans created during that work will be children of this active span. I’m instrumenting a Node.js app with OpenTelemetry, and adding some …
It also works with VSCode devcontainers and on GitPod. Because Step 1 in any new project is a reproducible development environment, and Step 2 is get it in production. Step 3 is implement something. Copy this code: systemsthinking-dev/poker-in-elm at starter (github.com) This is my accomplishment for the day, so I’m here to share it with …
Today I need to do some calculations for an article, so I want to persist them. The best way to do this is in a notebook, in Python. This Jupyter notebook thing that is exactly what I need. And VSCode recently added support for it! The installation instructions for Jupyter are all like “anaconda” and …
This is an experience report for my future reference (and yours). The OpenTelemetry Collector is useful for receiving trace data in whatever format and exporting it to the back-end of your choice for storage and querying. For instance, I wanted to receive traces over HTTP/JSON from this sneaky browser extensionLINK and send them to Honeycomb. …
Sometimes the obvious, default API is never what you want. That’s when you have to memorize the “do things right” flag. For yargs, the command-line argument parser for Node.js, specify options and subcommands like this: There. Next time I can cut and paste this instead of scouring the internet for how to make yargs do …
If you want secure code, or code with fewer bugs, you want to track the kind of data you’re passing around. In your code, do not pass around strings or any other built-in built-in primitive type. Those are for the edges: we have to accept strings as input, we have to write VARCHAR to the …
Read moreSpring and JPA: use custom value types inside entities with a custom converter