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feat: limit concurrent chat agents with pooled admission (#27902)

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Limits concurrent chat generation on capped deployments to 5 root chats
and 10 delegated subagent chats. The pools are deployment-wide and
independent, so delegated work can continue while root capacity is full.

The default caps live in AGPL code. Enterprise contributes only a
licensing unlock, so unlicensed deployments stay capped and cannot fail
open. Licensed deployments are uncapped while Agent Hours usage stays
below an explicit hard limit. Deployments without a hard limit remain
uncapped, and reaching the Agent Hours allocation only triggers
warnings.

Admission happens before a worker takes chat ownership. Capped
deployments serialize admission across replicas with a
transaction-scoped advisory lock and derive active and queued state from
current ownership plus fresh runner heartbeats, rather than persisted
queue markers or per-replica state. The acquisition query returns a
bounded, pool-interleaved candidate set instead of ranking the whole
backlog; a migration replaces the acquisition index with a pool-aware
one. Refused chats stay running but unowned, and interrupt requests
bypass admission so users can stop queued or over-cap chats.

The single-chat API derives `queued_for_capacity` from live pool state;
list endpoints do not report it. The UI polls that value every 5 seconds
while a chat is running and shows a callout when the chat is waiting for
capacity.

Updates the administrator documentation and deployment-wide Prometheus
gauges for active and queued agents. Replica-level values must be
aggregated with `max`, not `sum`.

> Mux updated this PR on Mike's behalf.
This commit is contained in:
Michael Suchacz
2026-08-18 16:55:43 +02:00
committed by GitHub
parent cb0a9ebbbf
commit 119f2b1dd9
51 changed files with 2187 additions and 277 deletions
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codersdk/chats.go
+6 -3
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@@ -141,9 +141,12 @@ type Chat struct {
// Context reports the chat's pinned workspace-context state and
// whether it has drifted from the agent's latest pushed snapshot.
// Nil when the chat has no pinned context yet.
Context *ChatContext `json:"context,omitempty"`
Warnings []string `json:"warnings,omitempty"`
ClientType ChatClientType `json:"client_type"`
Context *ChatContext `json:"context,omitempty"`
// QueuedForCapacity reports that the chat is waiting for a concurrent
// agent slot. Single-chat reads derive it; list responses leave it false.
QueuedForCapacity bool `json:"queued_for_capacity,omitempty"`
Warnings []string `json:"warnings,omitempty"`
ClientType ChatClientType `json:"client_type"`
// Children holds child (subagent) chats nested under this root
// chat. Always initialized to an empty slice so the JSON field
// is present as []. Child chats cannot create their own