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Consumer lag

How far a subscriber is behind: the messages waiting for it, or the age of the oldest one.

Taught in Chapter 33: Pub/sub.

More from the same chapter

• Message TTL: How long a copy may wait before it is dropped instead of delivered late.
• Subscriber: A service that gets its own copy of every message on a topic, and works through them at its own pace.
• Topic: A component that takes each published message once and puts a copy on every subscription's own backlog.