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A few days ago systemd gained tools which allow you to monitor Varlink traffic. A new Varlink service (io.systemd.VarlinkMonitor) allows you to set up a ring buffer which will get filled with packets containing the traffic which matches the filters you provide. This provides the functionality that org.freedesktop.DBus.Monitoring provides for D-Bus. A new varlinkctl monitor verb allows you to use this feature in terminals and scripts. This provides the functionality that dbus-monitor provides for D-Bus and uses io.systemd.VarlinkMonitor under the hood. If you pass --json short to varlinkctl monitor, it produces JSON-seq which can be passed into jq --seq to further process the captured data.
I presented this in the broader context of observability with Varlink at All Systems Go. Slides and video of the talk are available online.
This is a good start, but I think we should add more tooling around it. Especially Bustle would be an interesting target because it would allow us to capture D-Bus and Varlink at the same time and get a global view of what is going on in our systems again.
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(Watch "Liberec Dam 2026" on YouTube)
There's only a few places I get to take visiting friends to in Liberec. Sadly at the moment almost all of them are out of service. The city dam, Harcovská přehrada, is one of them. A fraction of the size of a neighboring Mšeno, it's set close to the middle of the city and is a wonderful walk/running place, despite only half having a foot path.
In the autumn of 2022, a full reconstruction finally began, a mere century after the dam was built. Quite a massive operation, with 26,000 cubic meters of silt dug out, the original masonry injected with a fresh waterproof jacket from a brand new gallery dug right under the dam, and the bottom outlets were swapped for beefier ones. Being a listed landmark, the dam got to keep its pretty face while the guts were replaced. A three-year job that -- in the finest local tradition -- took a bit longer and cost north of EUR 20 million. It's worth noting that Liberec is one if not the most indebted cities in Czechia.
In the meantime the city had a moonscape where its living room used to be. I went to investigate the drained bowl like everyone else and came back with a portrait short of the eerie emptiness, set to an electronica track that goes by Spore Structure:
(Watch "Spore Structure" on YouTube)
This year the water finally came back. Not yet finished, the lake is once again the city's front yard, has a refurbished beach, and a dam that's now rated to pass a 10,000-year flood. A figure I sincerely hope remains purely theoretical. To celebrate, I did the only reasonable thing: sent up a flying camera and cut the results to a tune. Sadly the dam claimed another one of my birds (currently the score is 2:0). A mistake had cost me one of older 5" as a broken OSD, ancient battery and water can lead to brisk ends. Luckily the tandem flight with a friend was done on my 4" and I have a video to share above.
The soundtrack was composed, as is the tradition around here, on the Dirtywave M8. Should watching atmospheric drum & bass slowly materialize out of a tracker over the course of a couple of hours sound like your idea of an evening, the recorded stream is up on YouTube.