The Drupal caching infrastructure (Varnish) will be upgraded to the version 7.3 for all sites on the following dates:
- 31 May from 09.00 to 18.00 for acceptance sites.
- 28 June from 09.00 to 18.00 for production sites.
⏳ The expected impact during those time frames is that each site might be down for five minutes and it is recommended not to launch any deployment.