The Opstral Engineering Blog
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- GlossaryWhat Are the Golden Signals?The four golden signals, from Google's SRE practice, are latency, traffic, errors and saturation. Monitoring these four for a user-facing service c...Read the definition →
- GlossaryWhat Is the RED Method?The RED method monitors three request-centric signals for a service: Rate (requests per second), Errors (failed requests), and Duration (latency di...Read the definition →
- GlossaryWhat Is the USE Method?The USE method, from Brendan Gregg, monitors every resource by three signals: Utilization (how busy it is), Saturation (how much work is queued or ...Read the definition →
- GlossaryWhat Is Head vs Tail Sampling?Sampling decides which traces to keep so you do not store all of them. Head sampling decides at the start of a trace (cheap, random, but may drop r...Read the definition →
- GlossaryWhat Are Exemplars?Exemplars are links from an aggregated metric, such as a specific histogram bucket, to an example trace that contributed to it, letting you jump di...Read the definition →
- GlossaryWhat Are Percentiles (p95, p99)?A percentile is the value below which a given share of observations fall. p95 latency is the value 95% of requests are faster than; p99 is the valu...Read the definition →
- GlossaryWhat Are OTel Semantic Conventions?OpenTelemetry semantic conventions are standardised names for attributes and metrics, such as http.request.method or db.system, so that telemetry f...Read the definition →
- GlossaryWhat Are Resource Attributes?Resource attributes are attributes that describe the entity producing telemetry, such as service.name, service.version, host.name or k8s.pod.name, ...Read the definition →
- GlossaryWhat Is Continuous Profiling?Continuous profiling is the ongoing, low-overhead sampling of a running production application to see which functions and lines of code consume CPU...Read the definition →
- GlossaryWhat Is Synthetic Monitoring?Synthetic monitoring proactively tests endpoints and user journeys with scripted probes on a schedule, from outside the system, to detect availabil...Read the definition →
- GlossaryWhat Is Real User Monitoring (RUM)?Real User Monitoring (RUM) captures performance and experience data from actual users' browsers or mobile apps, page load times, web vitals, errors...Read the definition →
- GlossaryWhat Is Agentic AIOps?Agentic AIOps is AIOps in which autonomous AI agents do more than detect and alert: they investigate an incident, decide on a course of action, and...Read the definition →