Queue without dead-letter queue

errorqueue-missing-dlq

A queue that receives asynchronous traffic and has no dead-letter queue either drops poison messages or retries them forever. Neither outcome leaves anything for a human to investigate.

Severity: error
Selects: every node of kind queue
Components in scope: 24

What it checks

It looks at every node of kind queue, and fires when:

— all of these hold:
— the node's `deadLetterQueue` is false
— the node has at least one asynchronous incoming edge

Message

Queue '{{node.id}}' receives async traffic but has no dead-letter queue.

{{node.id}} style paths are filled in from the node, the edge or the design the finding is about.

Applies to · 24 components

Queue queue

Tripped by · 17

Reference designs whose broken twin names this rule in its header. The gate reads the same header, and fails when a rule no design trips.

amazon-orderreference canva-uploadsreference duolingo-backendreference facebook-messengerreference github-mysqlreference gitlab-architecturereference gojek-platformreference google-mapsreference instagram-feedreference monzo-platformreference order-processingreference payment-systemreference pinterest-feedreference reddit-feedreference shopify-flash-salereference whatsapp-messagingreference youtube-upload-playbackreference

Source

1# yaml-language-server: $schema=../schema/rule.schema.json
2# A queue that receives asynchronous traffic and has no dead-letter queue drops or
3# infinitely retries poison messages. Tripped by designs/order-processing.broken.yaml.
4schemaVersion: "1"
5type: "rule"
6id: "queue-missing-dlq"
7severity: "error"
8select:
9  node:
10    kind: "queue"
11when:
12  all:
13    - prop: "deadLetterQueue"
14      equals: false
15    - hasEdge:
16        direction: "in"
17        mode: "async"
18message: "Queue '{{node.id}}' receives async traffic but has no dead-letter queue."

The same page as markdown, for an agent: /catalogue/rules/queue-missing-dlq.md