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#prometheus

6 messages6 participants0 message aujourd’hui

I recently discovered that diagnostic plugs in cars were more or less standard (OBD2) and that you could buy a plug reader for like 30 bucks. I also discovered that some OBD2 prometheus exporters exist.

So now basically my new project is to have a server in my car, like a RPi. It would srcap the OBD2 data locally and backfill it into my home prometheus database whenever the car gets into my home wifi range.

#tinkering #obd2 #prometheus #metrics #car

Is there an on-premise, open source option for a monitoring/telemetry platform comparable* to say New Relic or Dynatrace with an approachable query language?

Is Prometheus+Grafana pretty much it?

Simpler the better, approachable for a casual user (i.e. curious non-technical tenants) would be great.

* Caveats for "comparable" apply!

#Linux#RunBSD#telemetry

We've switched to my tool to measure latency and availability of our databases at work. This brand new tool, not yet open source, leverages the power of Prometheus histograms to measure those metrics finely.

I had to use DNS names instead of IP addresses to reach the endpoints, because it was easier to use (label = name).

But, the farthest the infrastructure was, the more degraded the measures were. Everything ran locally so what the hell? The level of degradation was not random, it was equal to the light distance to France.

It was DNS. It's always DNS.

The private zones were not deployed on the local resolvers, so we had a 200ms round trip in Australia, to reach resolvers in France, before actually connecting to the database.

The DNS cache didn't help at all.

#qos#latency#dns

So, I've been using Thanos to receive and store my prometheus metrics long term in a self hosted S3 bucket. Thanos also acts as a datasource for my dashboards in Grafana, and provides a Ruler, which evaluates alerting rules against my metrics and forwards them to my alertmanager. It's ok. It's certainly got it's downsides, which I can go into later, but I've thinking... what about Mimir?

How do you all feel about Grafana's Mimir (source on GitHub)? It's AGPL and seems to literally be a replacement of Thanos, which is Apache 2.0.

Thanos description from their website:

Open source, highly available Prometheus setup with long term storage capabilities.

Mimir description from their website:

...open source software project that provides horizontally scalable, highly available, multi-tenant, long-term storage for Prometheus and OpenTelemetry metrics.
Both with work with alloy and prometheus alike. Both require you to configure initially confusing hashrings and replication parameters. Both have a bunch of large companies adopting them, so... now I feel conflicted. Should I try mimir? Poll in reply.

Very happy to discover how easy it is to extend `node_exporter` with custom metrics:

Add `--collector.textfile.directory=/some/place` to the daemon's arguments (e.g. via ARGS in `/etc/default/prometheus-node-exporter`), and write `*.prom` files in that directory with your favorite tool, and **boom!**

Text format doc with a very good example: prometheus.io/docs/instrumenti

Creating Grafana alerts is something I'm less comfortable with, but I'm starting to get the hang of it…

prometheus.ioExposition formats | PrometheusAn open-source monitoring system with a dimensional data model, flexible query language, efficient time series database and modern alerting approach.

I'm going to be at #kubecon. At the maintainers summit beforehand, at the contribfest, and at the #headlamp project pavilion.

Contribfest session: kccnceu2025.sched.com/event/1t

I'm looking forward to connecting with folks working on different projects. People have been quite busy building out Headlamp Kubernetes UIs for ecosystem tooling and standards like #gatewayapi #prometheus #keda #flux #minikube #backstage #inspektorgadget #flagger and #certmanager

kccnceu2025.sched.comKubeCon + CloudNativeCon Europe 2025: 🚨 Contribfest: Make Your Own UI for Kube...View more about this event at KubeCon + CloudNativeCon Europe 2025