fix(metrics.go): add env var called IS_JENKINS (#1746)
fix(metrics.go): add env var called IS_JENKINS (#1746)


yangl900/acs-engine,weinong/acs-engine,jackfrancis/acs-engine,yangl900/acs-engine,rocketraman/acs-engine,jackfrancis/acs-engine,shrutir25/acs-engine,rjtsdl/acs-engine,jackfrancis/acs-engine,anhowe/acs-engine,Azure/acs-engine,rocketraman/acs-engine,rjtsdl/acs-engine,jackfrancis/acs-engine,rocketraman/acs-engine,Azure/acs-engine,anhowe/acs-engine,anhowe/acs-engine,yangl900/acs-engine,rjtsdl/acs-engine,anhowe/acs-engine,weinong/acs-engine,shrutir25/acs-engine,jackfrancis/acs-engine,Azure/acs-engine,weinong/acs-engine,rjtsdl/acs-engine,Azure/acs-engine,yangl900/acs-engine,anhowe/acs-engine,shrutir25/acs-engine,rjtsdl/acs-engine,yangl900/acs-engine,Azure/acs-engine,weinong/acs-engine,weinong/acs-engine,rocketraman/acs-engine,shrutir25/acs-engine,shrutir25/acs-engine