Scenario

Per-tenant fanout with a noisy neighbour

One worker pool serves every tenant. One tenant is forty times larger than the rest. Your SLO is per-tenant: every tenant's p99 must stay under 2 seconds, including the small ones. Traffic bursts hard at the top of the hour when scheduled jobs fire.

queue◹Tenantslocked⋔Admission1 decision▤Worker pool3 decisions▦Store—◈Downstreamlocked