Vagrant trigger desktop alerts after upgrading from 1.x to 2.2
Goal: configure a host-side desktop notification that fires when Vagrant provisioning completes, after upgrading a project from Vagrant 1.x to Vagrant 2.2 or later. Constraint: Vagrant 2.2 and later honor config.trigger blocks, while Vagrant 1.x ignores them. Vagrant provides no native notification channel, severity level, deduplication, or rate limiting. Tr