Within Unisphere, run the "High Availability Verification Wizard" from the "Monitoring" option in the toolbar. Review the report and see if the status is still valid.
There are reported incidents that upon an upgrade to FLARE 30 that hosts improperly report "HAVT Issues" when everything suggests otherwise. If this is the case for you, there are solutions but require some downtime on the affected hosts to clear. Please open an SR so that support can review and can confirm if this is being improperly flagged in Unisphere, and then they can provide you with several options to clear it (involves deregistering paths and/or removing hosts from storage groups and restarting SP management services; however, it is important you obtain the exact steps from support). Assuming it is confirmed as a false positive, it is then for you to decide if it is worth the slight downtime.