Blog
Notes on uptime, incidents, and reliability
Long-form articles from the Uptimera team on running reliable services, writing better postmortems, and choosing the right monitoring stack.
fundamentals
What is uptime monitoring? A complete guide
What uptime monitoring actually is, how it works, what an SLA really promises, and how to choose a monitoring tool you won't outgrow.
operations
How to write an incident postmortem (with template)
A practical, blame-free postmortem template — what to include, how to run the review meeting, and the five questions that drive real learning.
reliability
99.9% vs 99.99% SLAs explained (with downtime math)
What 'three nines' really means in minutes per month, why each extra nine is exponentially harder, and how to pick an SLA you can actually keep.
fundamentals
MTTR, MTBF, MTTD, MTTF: incident metrics that actually matter
The four reliability acronyms every engineering team gets asked about — what each one measures, how they're calculated, and which ones are worth tracking.
fundamentals
SLA vs SLO vs SLI: a practical guide for engineers
The difference between a service level indicator, objective, and agreement — and how Google SRE teams use all three to keep reliability honest.
fundamentals
Synthetic monitoring vs real user monitoring (RUM)
What synthetic checks and RUM each measure, why most teams need both, and how to decide which to invest in first when budget is tight.
fundamentals
DNS monitoring 101: what to check beyond the A record
Why DNS is the most common cause of 'mysterious' outages, what every team should monitor (records, nameservers, TTLs, resolvers), and how to detect propagation issues.
fundamentals
The HTTP status codes you'll see most often during outages
A field guide to 5xx, 4xx, and 0 responses in production — what each code typically means, the difference between 502 and 504, and which to alert on.
fundamentals
TCP, ICMP, and HTTP checks: which one to use when
The three primitives uptime monitors run on — what each actually tests, where they overlap, and the failure modes only one of them can catch.
operations
SSL certificate monitoring: never get caught by an expiry again
Why TLS cert expiries still take down major sites, what to monitor beyond the expiry date (chain, hostname, OCSP), and a reasonable warning schedule.
operations
Status page best practices: what to show during an outage
What a good status page looks like, what to say (and not say) during an incident, posting cadence, and the structural choices that build customer trust.
operations
How to set up an on-call rotation without burning out your team
Shift length, primary/secondary handoffs, fair compensation, escalation paths, and the policies that distinguish a healthy on-call from a soul-grinding one.
operations
How to fix alert fatigue (without going dark on real incidents)
Why noisy alerts erode trust faster than missed ones, the three tactics that actually reduce volume, and how to audit an existing alert set without breaking it.
operations
How to monitor a REST API (with a 9-point checklist)
What to actually check beyond '200 OK' — auth-aware probes, schema validation, latency budgets, dependency tracing, and the failure modes most teams miss.
operations
Cron job and heartbeat monitoring: catching silent failures
Why a successful cron run is the loudest silence in your infrastructure, how heartbeat monitoring works, and the alerting patterns that actually catch missed runs.
operations
Webhook monitoring: the silent-failure surface no one checks
Stripe, GitHub, and Twilio retry your webhooks. Then they give up. Here's how to monitor receivers as if they were customer-facing endpoints.
operations
Runbooks: a template on-call engineers will actually use
Why most runbooks rot the moment they're written, what to include (and exclude), and a one-page template that survives contact with a real 3am page.
operations
How to write an outage email customers will respect
The four parts of a credible outage notification, what to say before you know root cause, and the phrasing that keeps customers calm instead of churning.
reliability
Multi-region monitoring: why quorum matters more than coverage
Five probe regions don't help if any one of them can wake you up. Why N-of-M quorum is the single biggest false-positive killer in uptime monitoring.
reliability
Error budgets explained (Google SRE in 10 minutes)
What an error budget is, how to set one without overthinking it, and the policies that turn 'we ran out of budget' into a real engineering decision.
reliability
Chaos engineering for teams without a Netflix budget
How to introduce controlled failure into production safely, the four experiments worth running first, and why most teams overcomplicate this on day one.
reliability
The five whys: a postmortem technique that actually works
How to use root-cause questioning without it turning into a blame circle, plus a real worked example from a credentialing bug that took down checkout.
reliability
Monitoring a SaaS application: the 12-endpoint starter kit
A concrete list of the twelve URLs and surfaces every SaaS product should monitor on day one, with the failure modes each one catches.