Reliability
Guides, how-tos, and updates on Reliability.
14 articles
SLA vs SLO vs SLI: the reliability promise, decoded
Three little acronyms quietly run every serious reliability conversation — and almost everyone mixes them up. Here's what SLA, SLO and SLI actually mean, how they fit together, and how to set ones that won't page you at 3am for nothing.
Alert Fatigue: why your team stopped reading alerts (and how to fix it)
When everything alerts, nothing does. Alert fatigue is how real outages slip past tired teams — and it's fixable. Here's why it happens, what it costs, and how to get back to a pager you can trust.
The Blameless Postmortem: turning incidents into improvements (with a template)
After an outage you can hunt for someone to blame, or hunt for what to fix. Only one makes you more reliable. Here's how to run a blameless postmortem — plus a copy-paste template.
On-Call Best Practices: a rotation that doesn't burn people out
Done badly, on-call wrecks sleep, morale and retention. Done well, it's a fair, calm safety net the whole team trusts. Here's how to build the second kind.
Incident Metrics Explained: MTTR, MTTD, MTBF and friends
MTTR, MTTD, MTBF, MTTA — the alphabet soup of incident metrics, explained in plain English. What each measures, how to calculate it, and how to actually improve the numbers.
Incident Response: a step-by-step playbook
The alert just fired. Now what? A clear, repeatable incident-response process — from detection to all-clear — so the answer is never 'everyone panic'.
Disaster Recovery: RTO vs RPO explained
When the worst happens, two numbers decide how bad it really is: how much data you lose, and how long you're down. Here's what RTO and RPO mean, and how to set targets you can actually meet.
What is SRE? Site Reliability Engineering, explained
SRE is what you get when you treat reliability as an engineering problem instead of a firefighting one. Here's what Site Reliability Engineering actually means, its core ideas, and how it differs from DevOps.
Error Budgets Explained
An error budget turns the endless 'ship fast vs stay stable' fight into a single number both sides can see. Here's what it is, how to calculate it, and how it changes the way teams work.
Chaos Engineering Explained
Chaos engineering means deliberately breaking your own systems — in a controlled way — to find weaknesses before real failures do. Here's the idea, the method, and why it makes you more resilient.
Incident Severity Levels (SEV1–SEV4) Explained
Not every incident deserves the same response. Severity levels — SEV1 to SEV4 — give your team a shared language for 'how bad is this?' so the response always matches the reality.
How to Write a Good Runbook
A runbook turns 3am panic into a calm checklist. Here's what makes a runbook actually useful when an alert fires — and the mistakes that make them worthless.
Capacity Planning Basics
Run out of capacity at the wrong moment and your big day becomes an outage. Capacity planning is how you have the headroom before you need it. Here's the simple version.
High Availability Explained
High availability means designing so that one failure isn't an outage. Here's what HA actually means, the building blocks (redundancy, failover, no single point of failure), and how far to take it.