Convert int to string using rune() (#7707)
Convert int to string using rune() (#7707)

See https://github.com/golang/go/issues/32479

Fix #7706.

Signed-off-by: Robert-André Mauchin <aa2d2b4191fcc92df7813016d4b511c37a1b9a82@gmail.com>
GoogleCloudPlatform/prometheus,kangwoo/prometheus,GoogleCloudPlatform/prometheus,alileza/prometheus,GoogleCloudPlatform/prometheus,prometheus/prometheus,alileza/prometheus,kangwoo/prometheus,alileza/prometheus,prometheus/prometheus,keegancsmith/prometheus,keegancsmith/prometheus,keegancsmith/prometheus,keegancsmith/prometheus,kangwoo/prometheus,prometheus/prometheus,keegancsmith/prometheus,kangwoo/prometheus,GoogleCloudPlatform/prometheus,prometheus/prometheus,alileza/prometheus,prometheus/prometheus,alileza/prometheus,GoogleCloudPlatform/prometheus