Q: Can you define SLA, SLO, and SLI?
- SLI (Service Level Indicator): A quantitative, mathematical measure of some aspect of the level of service provided. Example: "The perc...
#Observability #Observability #L1 #Monitoring #Prometheus #SRE
🎙️ Candidate Opening & Architectural Context
""In an interview, I explain how we designed actionable, symptom-based alerting using the Four Golden Signals. The interviewer is testing: SRE terminology and hierarchy.. I structure my answer around systematic triage first, root cause analysis second, and permanent remediation third.""
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🛠️ Production Runbook & Step-by-Step Resolution
1️⃣
Initial Diagnostics & Root Cause Analysis
- SLI (Service Level Indicator): A quantitative, mathematical measure of some aspect of the level of service provided. Example: "The percentage of HTTP GET requests to
/homethat return a 200 OK within 100ms." - SLO (Service Level Objective): A target value or range of values for a service level that is measured by an SLI. Example: "The SLI will be 99.9% measured over a rolling 30-day window." It represents what the business defines as "healthy."
- SLA (Service Level Agreement): A legal and financial contract with the customer that outlines the consequences (penalties, refunds) if the SLO is not met. Example: "If we drop below 99.9%, we refund 10% of the monthly bill." SREs manage SLOs and SLIs; lawyers manage SLAs.
2️⃣
Remediation & Permanent Safeguards
Execute the resolution runbook and verify workload health:
💡 The Senior SRE Gold Nugget (Key Architectural Takeaway)
"Pro-Tip: SLI (Service Level Indicator): A quantitative, mathematical measure of some aspect of the level of service provided. Example: "The."
⚡ 60-Second Elevator Pitch Talking Points
- SLI (Service Level Indicator): A quantitative, mathematical measure of some aspect of the level o...
- SLO (Service Level Objective): A target value or range of values for a service level that is meas...
- SLA (Service Level Agreement): A legal and financial contract with the customer that outlines the...
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