Remove old metrics key `conv_index` for usage pings
Explanation
This is a follow-up issue from https://gitlab.com/gitlab-services/version-gitlab-com/-/merge_requests/299#note_276078084.
A series of two MRs changed usage ping to introduce an alternate key name of dev_ops_score
. The original key of conv_index
remains for backward compatibility. It can be eliminated once sufficiently few (and ideally zero) GitLab instances in the wild are still using conv_index
.
Status
This should be considered BLOCKED until at least 2022, when we should evaluate whethere there are still GitLab instances making usage ping calls with the conv_index
key.
Edited by Dan Jensen