This update fixes a regression which was significant enough that it was decided to backport to the release branch.
Bug Fixed
Vttablet: #6250 added support for float64 durations in the yaml. The change introduced a regression where the heartbeat interval unit was changed to seconds, but the conversion was not correspondingly changed. In other words, a heartbeat of 1s would have resulted in a value of 1000s instead. The net effect is that a healthy replica would be reported as heavily lagged.
This issue affects only those who enable heartbeats.
This regression was merged into https://github.com/vitessio/vitess/releases/tag/v6.0.20-20200617.
#6359 fixes #6356