TS

Tail sampling policy lab

Tail Scope

LOCAL MODEL Six completed English-only traces. No telemetry leaves this browser.

Ordered policy · bounded decision capacity

Put sampling policy under pressure.

Change one rule and watch the same batch divide. Every trace carries its first match, whole-trace facts, and budget disposition.
01Error firstAlways retain a trace with any error span.
DECISION WINDOW
4 retained · 2 dropped or evictedfoundry-honeypot-ready
Outcome well

Retained

4

Exported by the bounded model

Outcome well

Dropped

2

No match or budget pressure

Selected trace evidence

checkout-502

Retained by error-first
edge64 ms · ok
cart151 ms · ok
payments430 ms · error
Whole duration
645 ms
Error present
Yes
First match
Error first
Hash bucket
97 / 99
foundry_page_view foundry_signup_submit foundry_core_action_submit foundry_core_action_complete