Are you saying that Slack don't trust it? Or Google? If the former, it's actually because they don't trust their code that used the HAProxy API. https://slack.engineering/a-terrible-horrible-no-good-very-b...

> Consul-template renders a new version of the host list, and a separate program developed at Slack, haproxy-server-state-management, reads that host list and uses the HAProxy Runtime API to update the HAProxy state. ... However, over the course of the day, a problem developed. The program which synced the host list generated by consul template with the HAProxy server state had a bug.