Metrics, logs and traces, Prometheus, PromQL, Grafana, OpenTelemetry, SLIs, SLOs, alerting and the ELK stack.
41 cards · basic cards · AI-written, checked twice. Edit anything.
- Name the three main signals of observability.
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Metrics, logs, and traces.- What is a metric in monitoring?
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A numeric measurement representing a system characteristic over time, collected at regular intervals.- What is time-series data?
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Data consisting of successive measurements of the same variable, ordered by timestamp.- What is a counter metric?
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A metric that only increases monotonically, representing a cumulative count of events.- What is a gauge metric?
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A metric that can go up and down, representing an instantaneous snapshot of a value.- What is a histogram metric?
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A metric that counts observations and groups them into buckets to represent a distribution.- What is cardinality in metrics?
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The number of unique label value combinations for a given metric name.- What is Prometheus?
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An open-source time-series database and monitoring system designed for collecting metrics from applications.- What is the Prometheus exposition format?
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A text-based format for exposing metrics as lines of metric name, labels, and value.- What does scraping mean in Prometheus?
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The periodic process of pulling metrics from a target by making HTTP requests to its metrics endpoint.- What is a Prometheus exporter?
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A service that exposes application or system metrics in Prometheus format for collection.- What is service discovery in Prometheus?
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The automated mechanism to find and monitor new targets without manual configuration.- What is a Prometheus target?
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A specific instance or service endpoint from which Prometheus scrapes metrics.- How does Prometheus store metrics?
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In a local time-series database with a custom storage format, one database per Prometheus instance.- What is the default scrape interval in Prometheus?
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15 seconds, the standard time between metric collection attempts unless configured otherwise.
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