The Blog. From Circonus

Some Like It Flat

Some Like It Flat

JSON rules the world, much to our collective chagrin. I’ve mentioned before the atrocious shortcomings of JSON as a format and I feel deeply saddened that the format has taken the world by storm. However, it is here and we must cope… but not always. Like every other...

Site Maintenance Oct 23rd, 2017 10:00 EDT

We will be performing site wide maintenance on Monday, October 23rd, 2017 at 10:00am EDT (14:00 UTC). This maintenance is expected to last 15 minutes. During this window, the UI and API will be unavailable as we fail over to a new primary datacenter. This maintenance...

System Monitoring with the USE Dashboard

The USE method was developed by Brendan Gregg to study performance problems in a systematic way.1 It provides a simple, top-down approach to identify bottlenecks quickly and reliably. The gathering of performance metrics is usually done using a myriad of different...

Monitoring Queue Sizes

At Circonus we are collecting a number of metric about block devices. An interesting one is the average length of the request queue, which is exposed by iostat[1]: aqu-sz The average queue length of the requests that were issued to the device. Note: In previous...

Hosts, Metrics, and Pricing, Oh My!

As the number and types of monitoring vendors have risen over the past several years, so have the pricing models. With the rise of cloud based ephemeral systems, often running alongside statically provisioned infrastructure, understanding the monitoring needs of one’s...

Monitoring as Code

Circonus has always been API-driven, and this has always been one of our product’s core strengths. Via our API, Circonus provides the ability to create anything that you can in the UI and more. With so many of our customers moving to API-driven platforms like AWS,...

Postmortem: 2017-04-11 Firewall Outage

The Event At approximately 05:40AM GMT on 4/11/2017, we experienced a network outage in our main datacenter in Chicago, IL. The outage lasted until approximately 10:55AM GMT on the same day. The Circonus SaaS service, as well as any PUSH based checks that use the...

Documenting with Types

I've said this before: elegant code is pedagogical. That is, elegant code is designed to teach its readers about the concepts and relationships in the problem domain that the code addresses, with as little noise as possible. I think data types are a fundamental tool...

Post-Mortem 2017.1.12.1

TL;DR: Some users received spurious false alerts for approximately 30 minutes, starting at 2017-01-12 22:10 UTC. It is our assessment that no expected alerts were missed. There was no data loss. Overview Due to a software bug in the ingestion pipeline specific to...