Matthias Loibl

Matthias Loibl

@metalmatze.de

Director of @PolarSignals.com Cloud. Building cool products! 🧊 Maintainer of Parca, Pyrra, @Prometheus.io, PromOperator and more. PromCon organizer. @cncf.io Ambassador.

787 followers110 following211 posts

Matthias Loibl
@metalmatze.de

I keep seeing things about the iPhone Duo and hearing that the buttons move to the right side of the screen so they're easier to reach. Well, I'm left-handed, so it's probably the opposite for left-handed people, then? They made it a lot worse. 😄 Does anyone know anything about that?

Matthias Loibl reposted

Dash0
@dash0.com

Dash0 welcomes Polar Signals to the team. They built the leading continuous profiler for cloud native workloads, with GPU and CUDA support, and created Parca, the open source profiling project behind it. Profiling will live natively in Dash0, next to traces, metrics and logs. eu1.hubs.ly/H0xG-d70

Matthias Loibl
@metalmatze.de

Today is a big day! The last 5+ years at @polarsignals.com have been incredible! I couldn't be more excited to be part of what's next for @dash0.com observability!

Frederic Branczyk@brancz.com

🚀 Polar Signals is Joining Dash0! 🧊 I could not be more excited to bring continuous profiling to even more companies as well as take our database and make it the best foundation it can be for all of Observability! www.polarsignals.com/blog/posts/2...

polarsignals.comPolar Signals is Joining Dash0 | Polar SignalsThe next chapter for continuous profiling, our database, and the team
Matthias Loibl
@metalmatze.de

Little experiment: Make percent for pyrra.dev responsive to show as many decimal places as possible. Trailing .000 are trimmed and decimal places are only rounded if not enough space is left.

Matthias Loibl
@metalmatze.de

Super fun to see all sorts of things with. Like, you can see a @prometheus.io rule evaluation followed by GC and other interesting things.

Polar Signals@polarsignals.com

🔥Flame charts are now GA for all CPU profiles on Polar Signals Cloud. X-axis = wall-clock time, so periodic GC, phase shifts, and lock contention show up as patterns instead of getting averaged out. www.polarsignals.com/blog/posts/2...

polarsignals.comIntroducing Flame Charts for All CPU Profiles | Polar SignalsThe temporal dimension flame graphs might be missing.
Matthias Loibl
@metalmatze.de

Working at Polar Signals, I always come at things with a performance mindset. Running evals on our MCP turned out to be exactly that: performance engineering but for the model's context. Measuring the profiling skill's efficiency and effectiveness has been the real fun these past weeks. 😎

Polar Signals@polarsignals.com

Less context, better answers. 🔥 The new @polarsignals.com MCP makes smaller, more effective tool calls and iterates on what's actually worth querying. www.polarsignals.com/blog/posts/2...

polarsignals.comIteratively explore your flame graphs with the MCP sandwich tool | Polar SignalsDon't bloat your LLM's context. Let it iteratively explore the parts of your flame graphs that actually matter.

Matthias Loibl reposted

Alfonso Subiotto
@asubiotto.com

We've been working on a major schema migration at @polarsignals.com that has unlocked some pretty wild improvements. Apart from a 50% (!!) reduction in storage size thanks to logical compression in vortex.dev, there has been a dramatic improvement in query performance.

Matthias Loibl reposted

OpenTelemetry
@opentelemetry.io

OpenTelemetry ❤️ Prometheus! The #OTel and #Prometheus projects are strengthening interoperability. 🛠️ Building with both? Check out our client library comparison, plus updates on Prometheus compatibility and exporter spec stabilization. Links in 🧵! 🗳️ Running both? Take our survey! buff.ly/XhVm0Fg

docs.google.comSurvey: 🔭OpenTelemetry ↔ 🔥Prometheus InteroperabilityPrivacy notice: The data collected in this survey will be anonymised and publicly shared in the GitHub repositories prometheus-community/ux-research and opentelemetry/sig-end-user under the CC0 1.0…

Matthias Loibl reposted

Manoj Vivek
@manojvivek.bsky.social

Your Node.js profiles on @polarsignals.com just got personal!

Polar Signals@polarsignals.com

Tired of Node.js flamecharts full of `a`, `m`, and `_0x3f2`? We just shipped source maps support for Node.js profiles in Polar Signals Cloud. Just add a plugin to your build pipeline, and your profiles show the real code. Know more: www.polarsignals.com/blog/posts/2...

polarsignals.comDo more with less. | Polar SignalsPolar Signals Cloud is an always-on, zero-instrumentation continuous profiling for CPU, GPU, and Memory that helps improve performance, understand incidents, and lower infrastructure costs.
Matthias Loibl
@metalmatze.de

This is for a hobby thing, so I’m not super annoyed and I’ll simply continue tomorrow. Makes you think about the bigger picture nonetheless.

Matthias Loibl
@metalmatze.de

99.5% is slightly better than 3.5 hours in 28 days if we’re talking uptime. Really not great.

Pier@pierbover.com

woah damrnelson.github.io/github-histo...

Matthias Loibl reposted

Frederic Branczyk
@brancz.com

A historic step for profiling within the OpenTelemetry project!

Polar Signals@polarsignals.com

🥳 OpenTelemetry Profiling goes Alpha! Check out how to use it with open source Parca and Polar Signals Cloud! 🧊 www.polarsignals.com/blog/posts/2...

polarsignals.comDo more with less. | Polar SignalsPolar Signals Cloud is an always-on, zero-instrumentation continuous profiling for CPU, GPU, and Memory that helps improve performance, understand incidents, and lower infrastructure costs.

Matthias Loibl reposted

Polar Signals
@polarsignals.com

We caught up with Felix earlier this week at KubeCon EU, and TODAY he's presenting on the OpenTelemetry profiling signal reaching alpha, together with Florian. 📍 15:15, Hall 8, Room F Profiling as a first-class signal in OTel is huge. Don't miss it!

Matthias Loibl
@metalmatze.de

For the next hour and a half (until 16:30) I'll be at the Prometheus project booth! Come around to talk Prometheus, SLOs and more or just say hi. See you!

Matthias Loibl
@metalmatze.de

For local development you don't need a dedicated MCP server for CockroachDB, Prometheus, or Jaeger. Just exec into the container and run commands directly. SQL in cockroach, wget the Prometheus HTTP API, same for Jaeger. 😏

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Matthias Loibl
@metalmatze.de

All of this runs through the colima MCP server in Claude Code. claude mcp add-json colima '{"command":"npx","args":["-y","kubernetes-mcp-server@latest"],"env":{"KUBECONFIG":"'${HOME}'/.kube/config"}}' I've allow listed `mcp__colima__*`. Local VM, fully isolated. 🤌

Matthias Loibl
@metalmatze.de

For local development you don't need a dedicated MCP server for CockroachDB, Prometheus, or Jaeger. Just exec into the container and run commands directly. SQL in cockroach, wget the Prometheus HTTP API, same for Jaeger. 😏

Matthias Loibl
@metalmatze.de

curl isn't available, but wget is. kubectl exec -n observability prometheus-k8s-0 -- wget -qO 'localhost:9090/api/v1/query?query=up{job="api"}'

Matthias Loibl reposted

Polar Signals
@polarsignals.com

Polar Signals at #FOSDEM 2026 day 1! Tommy at 12:30 @ H.1308 (eBPF) OOMProf: Profiling Go heap memory at OOM time fosdem.org/2026/schedul... Thor at 17:25 @ UB2.252A (Databases) From Disks to Distributed: Our Journey of Database Evolution in the Cloud fosdem.org/2026/schedul...

fosdem.orgFOSDEM 2026 - OOMProf: profiling Go heap memory at OOM timeOOMProf is a Go library that installs a eBPF programs that listen to Linux kernel tracepoints involved in OOM killing and records a memory profile before your Go program is dead and gone. The memory…
Matthias Loibl
@metalmatze.de

Unfortunately, I won't be joining #FOSDEM. I got sick late last week and decided not to contribute to FOSDEM flu and canceled my trip. Have fun everyone! Next conference!

Matthias Loibl
@metalmatze.de

Let's scale Pyrra even further!

Polar Signals@polarsignals.com

We cut cross-zone traffic for SLO monitoring by 90% using Prometheus subquery optimization. The trick: pre-aggregate data locally instead of shuffling 55M raw samples to Thanos queriers. Coming soon to Pyrra! 🚀 www.polarsignals.com/blog/posts/2...

polarsignals.comDo more with less. | Polar SignalsPolar Signals Cloud is an always-on, zero-instrumentation continuous profiling for CPU, GPU, and Memory that helps improve performance, understand incidents, and lower infrastructure costs.
Matthias Loibl
@metalmatze.de

Imagine not having continuous profiling and sleeping on this. Wild.

Alfonso Subiotto@asubiotto.com

A simple 50-line code change saves us 30% of CPU across our whole infrastructure. This is the magic of system-wide profiling with @polarsignals.com. Easy to spot, easy to fix.

github.comperformance[vortex-array]: don't call is_valid to count bytes in varbinview by asubiotto · Pull Request #5814 · vortex-data/vortexI noticed that the better blocks compressor uses count_referenced_bytes which calls is_valid on each view and results in an expensive scalar_at call. This was 30% of our system-wide CPU usage over ...

Matthias Loibl reposted

Frederic Branczyk
@brancz.com

Next.js 16 + turbopack took our frontend builds from 5-7m down to just over 2m. This means faster speed of iteration in development and faster CI. Performance is UX. Performance is DX. Performance is a feature.

Matthias Loibl reposted

Thor
@thorfour.dev

Standing on the shoulders of giants. We built our new database on open source projects.

Polar Signals@polarsignals.com

🧊 New on the Polar Signals Blog — Our Delta Lake Fork Purpose-built for our continuous profiling product. In our latest post, we walk through how Delta Lake works, and the changes we've made to improve performance for our product. 👉 Read the full post: buff.ly/KwHINtO

polarsignals.comGreat Lakes: A Delta Lake ForkOur updates to Delta Lake Table Format

Matthias Loibl reposted

Polar Signals
@polarsignals.com

We completed a major project to switch our storage file format from Parquet to Vortex 🌪️ resulting in 70% average query performance improvement across the board 🚀 Learn more about how rethinking interface-imposed limitations unlocked these gains in our latest blog post 👇

Matthias Loibl reposted

Manoj Vivek
@manojvivek.bsky.social

Was digging into JS source maps recently and had a lot of fun writing this post, especially the interactive bits. 🤓

Polar Signals@polarsignals.com

Ever wondered how your browser devtools jumps from bundle.min.js:1:27698 → src/index.ts:73:16? 🧊 We unpack the internals of JS Source Maps: Base64 VLQ encoding, mapping deltas, and how your original TS code gets reconstructed from minified bundles. 🔗 www.polarsignals.com/blog/posts/2...

polarsignals.comThe Inner Workings of JavaScript Source MapsA deep dive into how JavaScript source maps work under the hood, with examples showing how all the pieces fit together.