Javier Guzman's Newsletter - Senior Software Engineer - Kubestronaut

Prometheus breadcrumb 5

March 03, 2026

This is the last of my Prometheus breadcrumbs series where I'm gonna briefly talk about rate operators, subqueries and push gateway. Just to have the cherry on the top of the series. Pushgateway Remember we mentioned in breadcrumb number two that Prometheus was the one grabbing metrics? By th

Prometheus breadcrumbs 4

February 26, 2026

Following my Prometheus breadcrumbs series I'm gonna talk about aggregation and vector matching, this is my forth breadcrumb, and the next one will wrap up the series with rate and irate operators as well as Push Gateway. Why to aggregate, and what is it? Prometheus allows you to aggregate me

Prometheus breadcrumbs 3

February 19, 2026

Last week we spoke about labels in Prometheus. This week I'm gonna talk about scalability, that's where all the meat is when we talk about infrastructure. So when we talk about observability, at the end of the day it's just one entity grabbing logs and metrics from every element of your

Prometheus breadcrumbs 2

February 11, 2026

Last week I explained the types of metrics Prometheus can handle. This week I'll just speak briefly about labels. What are labels? Every time Prometheus grabs a metric, such a metric has labels associated with it so we can tag and identify the metric. Imagine the metric is memory used, how do

Prometheus breadcrumbs 1

February 05, 2026

Hello all, It has been a while since the last knowledge breadcrumb. I've been busy with life in general, and I want to come back with this type of content as it's short and valuable. This week we are going to start with a series about Prometheus, specifically for today, we are going to expl

Cilium breadcrumbs 4

Cilium Kubernetes

February 03, 2026

Last week I posted IPAM modes in Cilium. This week's breadcrumbs we continue with Cilium and is about Load Balancing, or in other words, how Cilium can replace your MetalLB. In Cilium you can create Load Balancers and for them to work you just need to manage to assign it an IP that is reachable

Cilium breadcrumbs 3

Cilium Kubernetes

February 03, 2026

Last week I posted routing modes of Cilium within Kubernetes and the previous one about the main components of Cilium. This week's breadcrumbs are about IP Allocation modes though correct name is IP Address Management (IPAM). In Kubernetes when you create a pod, it gets assigned an IP, but some

Cilium breadcrumbs 2

Cilium Kubernetes

February 03, 2026

Last week I posted main components of Cilium within Kubernetes. This week's breadcrumbs are about routing modes. Routing modes refer to how packets sent from a pod arrive to their destination. Cilium supports two routing modes. 1. Native mode: It's best for performance. The packet sent by