# Tail-based sampling

> Keeps slow and failed traces: twice the Failure Insight.

## Prerequisites

Research these first: [Distributed tracing](https://wiki.playquorum.dev/research/tracing.md).

## Facts

Tail-based sampling
- **Track:** Observability
- **Era:** [Series B](https://wiki.playquorum.dev/eras/series-b.md)
- **Cost:** 10.0k
- **Requires:** [Distributed tracing](https://wiki.playquorum.dev/research/tracing.md)

## See also

- [Research tree](https://wiki.playquorum.dev/research.md)

Source: https://wiki.playquorum.dev/research/tail-sampling