Lili Cosic
@lilicosic.com
👩🏻💻Senior Software Engineer at InfluxData. 📉 Advisor to Polar Signals.
I enjoy talking about observability, databases, all things cloud and good food.
Previously @ HashiCorp, Red Hat, etc.
Now in Berlin 🇩🇪 from 🇸🇮
(Opinions my own!)
https://lilicosic.com
I enjoy talking about observability, databases, all things cloud and good food.
Previously @ HashiCorp, Red Hat, etc.
Now in Berlin 🇩🇪 from 🇸🇮
(Opinions my own!)
https://lilicosic.com
I submitted an expense report to myself and it auto-closed it. Why is that the default in expensify. You have one job. 🤦🏻♀️
November 13, 2025 at 3:28 PM
I submitted an expense report to myself and it auto-closed it. Why is that the default in expensify. You have one job. 🤦🏻♀️
Tried to do this with chatgpt and got this as the result.
Its a work of art.😂
Its a work of art.😂
November 11, 2025 at 6:17 PM
Tried to do this with chatgpt and got this as the result.
Its a work of art.😂
Its a work of art.😂
Distributed systems, some days I love them, some days I hate them. 😭
November 7, 2025 at 1:51 PM
Distributed systems, some days I love them, some days I hate them. 😭
Reposted by Lili Cosic
Async QUIC and HTTP/3 made easy: tokio-quiche is now open-source blog.cloudflare.com/async-quic-a...
Async QUIC and HTTP:3 made easy- tokio-quiche is now open-source
We’re excited to announce the open sourcing of tokio-quiche, our async QUIC library built on quiche and tokio. Relied upon in our services such as iCloud Private Relay and our next-generation…
blog.cloudflare.com
November 7, 2025 at 9:02 AM
Async QUIC and HTTP/3 made easy: tokio-quiche is now open-source blog.cloudflare.com/async-quic-a...
Reposted by Lili Cosic
Anyone come across a project that catalogs where you can fetch k8s components from? Eg cluster-api from GitHub releases, here are the links. Azure IAM controller, helm chart, here are the link. Plus compatible k8s versions and interdependencies? Seems a big job, but would be very helpful
November 4, 2025 at 12:38 PM
Anyone come across a project that catalogs where you can fetch k8s components from? Eg cluster-api from GitHub releases, here are the links. Azure IAM controller, helm chart, here are the link. Plus compatible k8s versions and interdependencies? Seems a big job, but would be very helpful
Reposted by Lili Cosic
Headed to AWS re:Invent? Visit us at booth 151!
Come talk time series, real-time intelligence, and #InfluxDB 3 on Amazon Timestream for InfluxDB.
Ask us anything about scaling on AWS, and enter our raffle while you're there: https://bit.ly/3LxQQeo
Come talk time series, real-time intelligence, and #InfluxDB 3 on Amazon Timestream for InfluxDB.
Ask us anything about scaling on AWS, and enter our raffle while you're there: https://bit.ly/3LxQQeo
November 3, 2025 at 3:45 PM
Headed to AWS re:Invent? Visit us at booth 151!
Come talk time series, real-time intelligence, and #InfluxDB 3 on Amazon Timestream for InfluxDB.
Ask us anything about scaling on AWS, and enter our raffle while you're there: https://bit.ly/3LxQQeo
Come talk time series, real-time intelligence, and #InfluxDB 3 on Amazon Timestream for InfluxDB.
Ask us anything about scaling on AWS, and enter our raffle while you're there: https://bit.ly/3LxQQeo
Tired of rage bait tech posts. If it doesn't add value, it's just wasting everyone's time.
November 3, 2025 at 4:02 PM
Tired of rage bait tech posts. If it doesn't add value, it's just wasting everyone's time.
Reposted by Lili Cosic
New version of Rust Apache Arrow and Apache Parquet is out -- includes new new metadata parser, new avro reader, geometry and variant support 🤯 arrow.apache.org/blog/2025/10...
Apache Arrow Rust 57.0.0 Release
The Apache Arrow team is pleased to announce that the v57.0.0 release of Apache Arrow Rust is now available on crates.io (arrow and parquet) and as source download. See the 57.0.0 changelog for a full...
arrow.apache.org
October 31, 2025 at 10:26 AM
New version of Rust Apache Arrow and Apache Parquet is out -- includes new new metadata parser, new avro reader, geometry and variant support 🤯 arrow.apache.org/blog/2025/10...
Reposted by Lili Cosic
I noticed that cross-zone traffic has once again crept up on us at Polar Signals, so I dusted off kubezonnet, and implemented a few new features/bug fixes as I was troubleshooting.
I present v0.2.0, which we just used to cut 62% of cross-zone traffic. Real money saved.
github.com/polarsignals...
I present v0.2.0, which we just used to cut 62% of cross-zone traffic. Real money saved.
github.com/polarsignals...
Release v0.2.0 · polarsignals/kubezonnet
What's Changed Fix bug about packet sizes being read incorrectly, causing especially small sizes to be inflated. f79dc1b Add port information to flow logs. c136e7c New Contributors @metalmatze m...
github.com
October 31, 2025 at 12:20 PM
I noticed that cross-zone traffic has once again crept up on us at Polar Signals, so I dusted off kubezonnet, and implemented a few new features/bug fixes as I was troubleshooting.
I present v0.2.0, which we just used to cut 62% of cross-zone traffic. Real money saved.
github.com/polarsignals...
I present v0.2.0, which we just used to cut 62% of cross-zone traffic. Real money saved.
github.com/polarsignals...
Reposted by Lili Cosic
If you're at #UbuntuSummit Thursday and Friday, come hear me speak about how we created the world's first open-source low-overhead always-on #NVIDIA #CUDA Profiler! discourse.ubuntu.com/t/infrastruc...
#performance #GPU
#performance #GPU
October 22, 2025 at 2:31 PM
If you're at #UbuntuSummit Thursday and Friday, come hear me speak about how we created the world's first open-source low-overhead always-on #NVIDIA #CUDA Profiler! discourse.ubuntu.com/t/infrastruc...
#performance #GPU
#performance #GPU
Reposted by Lili Cosic
I could not be more excited about this. To our knowledge, the world's first open-source low-overhead always-on GPU profiler!
As always, zero-instrumentation and powered by #eBPF!
As always, zero-instrumentation and powered by #eBPF!
🚀 We're super excited to launch NVIDIA CUDA Profiling today! Check out the blog on how we made it happen! 🧊
www.polarsignals.com/blog/posts/2...
www.polarsignals.com/blog/posts/2...
Continuous NVIDIA CUDA Profiling In Production
Low-Overhead Profiling of GPUs with USDT Probes and eBPF
www.polarsignals.com
October 22, 2025 at 2:07 PM
I could not be more excited about this. To our knowledge, the world's first open-source low-overhead always-on GPU profiler!
As always, zero-instrumentation and powered by #eBPF!
As always, zero-instrumentation and powered by #eBPF!
Reposted by Lili Cosic
Follow Up - Preventing Upgrade Failures from etcd v3.5 to v3.6-
Follow Up - Preventing Upgrade Failures from etcd v3.5 to v3.6
We have identified and fixed an additional scenario that may cause upgrade failures when moving from etcd v3.5 to v3.6. This post contains details, the fix, and additional workarounds. Please refer to...
etcd.io
October 22, 2025 at 1:07 AM
Follow Up - Preventing Upgrade Failures from etcd v3.5 to v3.6-
Recovering from COVID first time, is like recovering from being run over by a bus. 😫
October 21, 2025 at 4:44 PM
Recovering from COVID first time, is like recovering from being run over by a bus. 😫
Reposted by Lili Cosic
Native Histogram considered stable in @Prometheus.io going forward! 🥳
Props to all the people who worked on this for years!
Props to all the people who worked on this for years!
October 21, 2025 at 3:15 PM
Native Histogram considered stable in @Prometheus.io going forward! 🥳
Props to all the people who worked on this for years!
Props to all the people who worked on this for years!
Being alone when you are sick is the worst! I am just grateful I live in a city that offers such good delivery services so I can order everything I need home.
October 11, 2025 at 2:06 PM
Being alone when you are sick is the worst! I am just grateful I live in a city that offers such good delivery services so I can order everything I need home.
The week after I do a declutter of my tea cups I get sick and need extra cups.
October 9, 2025 at 1:42 PM
The week after I do a declutter of my tea cups I get sick and need extra cups.
Reposted by Lili Cosic
So cool and parca.dev getting mentioned out of nowhere. Love to see it!
New tooling for profiling performance-critical services with Swift -- introducing the Swift Profile Recorder. More here: www.swift.org/blog/swift-p...
October 8, 2025 at 7:54 AM
So cool and parca.dev getting mentioned out of nowhere. Love to see it!
Reposted by Lili Cosic
We are alarmed by reports that Germany is on the verge of a catastrophic about-face, reversing its longstanding and principled opposition to the EU’s Chat Control proposal which, if passed, could spell the end of the right to privacy in Europe. signal.org/blog/pdfs/ge...
signal.org
October 3, 2025 at 4:14 PM
We are alarmed by reports that Germany is on the verge of a catastrophic about-face, reversing its longstanding and principled opposition to the EU’s Chat Control proposal which, if passed, could spell the end of the right to privacy in Europe. signal.org/blog/pdfs/ge...
Reposted by Lili Cosic
If you are a German citizen, please consider contracting your MPs and Ministers. We’ve created a guide on what MPs to contact as well as example arguments:
chat-kontrolle.eu/index.php/20...
chat-kontrolle.eu/index.php/20...
Der Kampf gegen die Chatkontrolle braucht dich jetzt! – Chatkontrolle STOPPEN!
chat-kontrolle.eu
October 3, 2025 at 8:20 PM
If you are a German citizen, please consider contracting your MPs and Ministers. We’ve created a guide on what MPs to contact as well as example arguments:
chat-kontrolle.eu/index.php/20...
chat-kontrolle.eu/index.php/20...
Reposted by Lili Cosic
‘Chief Of War’ Producers Confirm Season 2 Will Show Hawaiians Battling Mark Zuckerberg https://theonion.com/chief-of-war-producers-confirm-season-2-will-show-hawaiians-battling-mark-zuckerberg/
September 22, 2025 at 3:00 PM
‘Chief Of War’ Producers Confirm Season 2 Will Show Hawaiians Battling Mark Zuckerberg https://theonion.com/chief-of-war-producers-confirm-season-2-will-show-hawaiians-battling-mark-zuckerberg/
Love slack reminders but wish the snooze had random timing. Currently when I snooze everything “until Monday,” I get an absolute avalanche of 20+ notifications at 9am Monday😅
Why can’t we spread them out randomly throughout the day.
Why can’t we spread them out randomly throughout the day.
September 26, 2025 at 11:45 AM
Love slack reminders but wish the snooze had random timing. Currently when I snooze everything “until Monday,” I get an absolute avalanche of 20+ notifications at 9am Monday😅
Why can’t we spread them out randomly throughout the day.
Why can’t we spread them out randomly throughout the day.
Reposted by Lili Cosic
CloudFlare's Distributed R2 SQL engine's is a pretty good exemplar of how to build a serverless database to process petabytes in seconds using Apache DataFusion and Apache Parquet
blog.cloudflare.com/r2-sql-deep-...
blog.cloudflare.com/r2-sql-deep-...
R2 SQL: a deep dive into our new distributed query engine
R2 SQL provides a built-in, serverless way to run ad-hoc analytic queries against your R2 Data Catalog. This post dives deep under the Iceberg into how we built this distributed engine, from its metad...
blog.cloudflare.com
September 26, 2025 at 10:29 AM
CloudFlare's Distributed R2 SQL engine's is a pretty good exemplar of how to build a serverless database to process petabytes in seconds using Apache DataFusion and Apache Parquet
blog.cloudflare.com/r2-sql-deep-...
blog.cloudflare.com/r2-sql-deep-...
Wow the NBA packages for the Berlin NBA game next year are extra expensive. I get the feeling rarely anyone buys these and they are given to some sponsors. 😭
September 25, 2025 at 1:44 PM
Wow the NBA packages for the Berlin NBA game next year are extra expensive. I get the feeling rarely anyone buys these and they are given to some sponsors. 😭
Reposted by Lili Cosic
InfluxDB 3.4 is live! 🙌
Simplify cache management, automate tokens, and streamline licensing for smoother workflows and stronger security.
See what’s new: https://bit.ly/45C4m8F
Simplify cache management, automate tokens, and streamline licensing for smoother workflows and stronger security.
See what’s new: https://bit.ly/45C4m8F
September 14, 2025 at 5:44 PM
InfluxDB 3.4 is live! 🙌
Simplify cache management, automate tokens, and streamline licensing for smoother workflows and stronger security.
See what’s new: https://bit.ly/45C4m8F
Simplify cache management, automate tokens, and streamline licensing for smoother workflows and stronger security.
See what’s new: https://bit.ly/45C4m8F
Reposted by Lili Cosic
I shared more context on Reddit: www.reddit.com/r/databasede...
September 14, 2025 at 8:57 PM
I shared more context on Reddit: www.reddit.com/r/databasede...