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Upgrading OS on hypervisors

Hello Folks

I have a question regarding upgrading OS on hypervisor. We have few platforms with around 200 hypervisors in each platforms. Every time a new Ubuntu kernel comes in with new security patch like L1TF fix or other , we need to upgrade kernel on all hypervisors. Before rebooting hypervisor we enable maintenance on it so that all vm's are migrated away. During this maintenance we always see some Network interruptions because of live migrations. 

How are you guys handling such situations and how are doing the OS upgrades? If you have some suggestions or using some automation tools then please let know

I want to reduce time taken to upgrade all hypervisors without any impact to Networks or VM's

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