Reliable Insights

A blog on monitoring, scale and operational Sanity

October 5, 2020

How long can Prometheus retention be?

Data is smaller and disks are bigger than you'd think.

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September 7, 2020

Why does Prometheus use so much RAM?

Users are sometimes surprised that Prometheus uses RAM, let's look at that.

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November 2, 2015

Avoid outages: Beware the Knee

Your service's traffic is steadily growing, latency has increased a bit but it's within reason. One day you launch a new customer and the latency jumps through the roof causing an outage. What happened? You hit the knee.

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September 14, 2015

Do you know your peak-to-mean ratio?

Traffic from users to your servers isn't a steady stream, it waxes and wanes over the day and week. The peak-to-mean ratio is your primary tool to avoid outages or unnecessary costs due to this.

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August 12, 2015

The Three Types of Cache

Caches are a common feature of distributed systems, often added to improve performance. There are three main types of cache, and knowing about them will help you design robust systems.

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