Tools / Apache HertzBeat Interview Questions
Explain the execution flow from monitor creation to alert notification?
This end-to-end flow is a good one to walk through out loud in an interview, since it touches nearly every module in the system.
sequenceDiagram
participant U as User (Angular Web UI)
participant M as Manager
participant C as Collector
participant Q as Internal Queue
participant W as Warehouse
participant Al as Alerter
participant N as Notification Channel
U->>M: Define monitor from YML template
M->>C: Schedule and dispatch collection job
C->>Q: Publish collected metrics
Q->>W: Consume and persist metrics
Q->>Al: Consume and evaluate threshold rules
Al-->>N: Dispatch alert if rule fires
The user only interacts with the first and last steps — defining the monitor and receiving the notification — while scheduling, collection, storage, and evaluation all happen automatically once that monitor exists.
Who or what initiates the very first step of this flow?
The warehouse and alerter both consume data from:
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