# Observability

> How well you can understand a system's internal state from what it emits: logs, metrics and traces.

URL: https://pagerless.dev/glossary/observability
Updated: 2026-10-22

## In Pagerless

Pagerless is the alerting end: it reads errors, metrics, heartbeats and OTLP data and decides who needs to know.

## Related terms

- [OpenTelemetry](https://pagerless.dev/glossary/opentelemetry): A vendor-neutral standard and set of SDKs for producing logs, metrics and traces, sent over the OTLP protocol.