What Is SRE (Site Reliability Engineering)?
SRE is what happens when you treat operations as a software problem. Born at Google, Site Reliability Engineering replaces heroic firefighting with engineering: measurable reliability targets, automation for everything repetitive, and the radical idea that some amount of failure is a budget to spend, not a sin to hide.
The Four Habits of SRE
SLOs & error budgets
Define how reliable is reliable enough; spend the remainder on shipping.
Automate the toil
Anything done twice by hand becomes a candidate for code.
Blameless postmortems
Incidents produce fixes and learning, not scapegoats.
Ops as engineering
Runbooks, monitoring, and remediation built and versioned like software.
SRE Below the Operating System
SRE grew up in environments where hardware was someone else's problem. On-prem and data center teams adopting SRE hit the gap immediately: your error budget doesn't care whether the burn came from a bad deploy or a dying power supply — but your tooling usually only sees the first. Applying SRE to physical estates means extending the same discipline downward: component telemetry as SLIs, hardware alarms in the same correlation engine as application alerts, automated inspection replacing walkthroughs, and remediation through out-of-band control that works when SSH doesn't. That lower half of the stack is exactly the layer Sensaka instruments.
Common Questions About SRE
What does SRE mean?
SRE stands for Site Reliability Engineering — the discipline (from Google) of applying software engineering to operations: automating toil, defining reliability targets (SLOs), and treating uptime as an engineering problem rather than a heroics problem.
What is a site reliability engineer?
An engineer responsible for a service's reliability: setting SLOs and error budgets, building automation and monitoring, running incident response, and reducing manual operational work through code.
What is the difference between SRE and DevOps?
DevOps is a culture of shared ownership between development and operations; SRE is a concrete implementation of it with specific practices — SLOs, error budgets, blameless postmortems, and a cap on manual toil.
Do SRE practices apply to physical infrastructure?
Increasingly, yes. Error budgets and automation assume you can measure and act on the whole stack — which for on-prem estates means extending telemetry below the OS: hardware health, power, thermals, and out-of-band remediation.