web:Fix a potential goroutine leak by channel (#8965)
web:Fix a potential goroutine leak by channel (#8965)

Signed-off-by: lzhfromustc <f7f149e5a659fc13c80c604a2bf83d2463599785@gmail.com>
prometheus/prometheus,prometheus/prometheus,keegancsmith/prometheus,prometheus/prometheus,prometheus/prometheus,keegancsmith/prometheus,prometheus/prometheus,keegancsmith/prometheus,keegancsmith/prometheus,keegancsmith/prometheus