kubernetes service discovery quesition

[swapnil surve]

Hi,

When using kubernetes sd config in prometheus, how frequently prometheus scrapes kubernetes master to get active targets to scrape? I think it does `watch` call to kubernetes master. That means it holds the connection to master. Does prometheus periodically close the connections? If there are many kubernetes sd configs, doesn't it overload master with many connections that remain active for long duration?

Regards,

Swapnil,