This document is for guiding how to develop IoTDB restful module for supporting Prometheus and Grafana in Java (backend) and TypeScript (frontend of Grafana).

Prometheus:

Prometheus is written by Go. It can write data into (and query data from) TSDBs if the TSDBs have restful API.

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Therefore, to implement iotdb-prometheus module, you need to know: 1. protocol buffer; 2. restful service; 

Protocol Buffer:

Prometheus 2.9 uses ProtoBuf 2.13.2. So, it is better to use ProtoBuf 2.13.2.

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