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IT Operations & Observability terms
Monitoring, tracing, logs and AIOps: knowing what production is doing.
Application performance monitoring (APM) Monitoring that tracks application response time, errors, and throughput, tying degraded performance to its root cause. Distributed tracing Following a single request across multiple services in a distributed system to see where time was spent or an error occurred. Error budget The amount of unreliability a service is allowed over a period, equal to 100% minus its service level objective. Log aggregation Collecting log data from many separate systems into one centralized, searchable store instead of checking each system individually. Mean time to detect (MTTD) The average time between when an incident begins and when a team becomes aware of it. Mean time to resolve (MTTR) The average time from when an incident is detected to when it is fully resolved and normal service is restored. Metric cardinality The number of unique time series a metric produces, driven by every distinct combination of its labels or tags. Service level indicator (SLI) The specific, measured metric, such as success rate or latency, used to judge a service's performance against a target. Service level objective (SLO) An internally set reliability or performance target, measured over a time window, set above any contractual SLA.