Proposal

Hi~ We are alibaba aliyun team, we have a aliyun ecs discovery implement.
https://github.com/AliyunContainerService/prometheus/tree/master/discovery/ecs

https://github.com/AliyunContainerService/prometheus/blob/feature/aliyun-ecs-discovery/discovery/aliyun/README.md

Can we take a merge-request of our commit to master branch?

• pressure test: this implement support pressure test with 1K+ ECS, and every ECS have 20 tags, support frequency ECS scale scenario.
• support filter with ECS label.
• use scrolling API to discovery ecs to support frequency ECS scale change scenario.
• we can do some translation to English.