The Opstral Engineering Blog
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- GlossaryWhat Are Metrics (Counter, Gauge, Histogram)?Metrics are numeric measurements recorded over time. The three core instrument types are the counter (a cumulative value that only increases), the ...Read the definition →
- GlossaryWhat Are Structured Logs?Structured logs are log records emitted as machine-readable key-value data (often JSON) rather than free-form text, so they can be filtered, aggreg...Read the definition →
- GlossaryWhat Is Telemetry?Telemetry is the data a system emits about its own behaviour, primarily the three signals of traces, metrics and logs (with profiling emerging as a...Read the definition →
- GlossaryWhat Is Observability?Observability is the ability to understand a system's internal state from the telemetry it emits, to the point where you can answer new questions a...Read the definition →
- GlossaryWhat Is the OpenTelemetry Collector?The OpenTelemetry Collector is a vendor-neutral service that receives, processes and exports telemetry through a configurable pipeline of receivers...Read the definition →
- GlossaryWhat Is Auto-Instrumentation?Auto-instrumentation is the automatic capture of telemetry from common libraries and frameworks without writing tracing code, typically through a l...Read the definition →
- GlossaryWhat Is High Cardinality?Cardinality is the number of distinct values a dimension can take. High cardinality means a field with very many unique values, such as user ID or ...Read the definition →
- GlossaryWhat Is PromQL?PromQL is the Prometheus Query Language, used to select and aggregate time-series metrics. It underpins most metric dashboards and alerts and is wi...Read the definition →
- GlossaryWhat Is a Service Map?A service map is an automatically generated topology of your services and how they call each other, derived from distributed traces, showing the de...Read the definition →
- GlossaryWhat Is an SLO?A Service Level Objective (SLO) is a target for a reliability metric over a time window, for example 99.9% of requests succeeding over 30 days. It ...Read the definition →
- GlossaryWhat Is an SLI?A Service Level Indicator (SLI) is the measured quantity that expresses how well a service is performing, such as the proportion of successful requ...Read the definition →
- GlossaryWhat Is an Error Budget?An error budget is the amount of unreliability a service is allowed, calculated as one minus the SLO. If the SLO is 99.9%, the error budget is 0.1%...Read the definition →