Observability Platforms provide the unified telemetry stack engineering teams use to operate production systems — collecting, storing, querying, and visualizing logs, metrics, distributed traces, real-user monitoring (RUM), and synthetic monitoring data. Core capabilities include multi-pillar telemetry ingestion (OpenTelemetry native), long-term metric/log/trace storage with cost-tiered retention, correlation and context propagation across pillars, alerting and SLO tracking, dashboards and query interfaces, AIOps anomaly detection, and service-map visualization. The category spans unified platforms (Datadog, New Relic, Dynatrace, Splunk Observability) and composable OSS-oriented stacks (Grafana Cloud with Prometheus/Tempo/Loki; Elastic Observability; Chronosphere; Honeycomb).