Eric D. Schabell: PromCon EU 2022: Centralized vs. Decentralized - How DoorDash Collects Prometheus Metrics (accepted)

Tuesday, October 11, 2022

PromCon EU 2022: Centralized vs. Decentralized - How DoorDash Collects Prometheus Metrics (accepted)

This year PromCon EU 2022 in Munich, Germany is the seventh edition where all things dedicated to the open source Prometheus monitoring system are on display. 

The last in person edition was in 2019 and you can see what that was like in their video recap.

As they state on their website, this conference is to "...connect Prometheus users and developers from around the world in order to exchange knowledge, best practices, and experience gained around using Prometheus. We also want to collaborate to build a community and grow professional connections around systems and service monitoring."

Since the event will be in person this year it seemed like a great idea to submit something technically interesting and we happen to have a great story to tell with a customer around centralized verses decentralized metrics collection at a very large scale.

Together with DoorDash, I'm co-presenting the following story about insights into metrics collection at very large scale.

Centralized vs. decentralized - How Doordash collects Prometheus metrics

There are two primary approaches to scrape and collect metrics using Prometheus - using a centralized set of dedicated scrapers or decentralized scrapers that run as an agent. With centralized scraping, Prometheus is deployed as a central scraper to pull metrics from all discoverable endpoints and sometimes can be split across multiple centralized instances using a few different approaches. However, with a decentralized approach, Prometheus runs as an agent, in Kubernetes is deployed as a DaemonSet on each node in a cluster, and only collects metrics from the node it runs on. Each model has pros and cons - especially when operating at large scale - which can make it difficult when deciding which model to use.  

In this session, we'll provide an overview of Prometheus metrics collection at DoorDash, where having highly reliable resources, easy endpoint discovery, and real-time insights is critical. They will share insights and best practices into DoorDash’s decision to implement a decentralized model by offering pros and cons of each approach. Leave with a better understanding of the “right” model for your use case(s).

Date: Tue, 8 Nov 2022
Time: 15:45 - 16:15 CET

The schedule has yet to be published, you can register for the event and join us in Munich on November 8-9. Hope to see you there!

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