Per https://wikitech.wikimedia.org/wiki/Incident_documentation/20190211-varnish, a more comprehensive PCC run would have stopped the incident. Investigate on how to have CI conduct such a comprehensive run on VCL changes.
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Note that VTC tests do not have to be run on cache servers anymore. They can be executed from SRE workstations using vagrant, which should help here. See https://wikitech.wikimedia.org/wiki/Varnish#Configuration
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The swap of Traffic for Traffic-Icebox in this ticket's set of tags was based on a bulk action for all such tickets that haven't been updated in 6 months or more. This does not imply any human judgement about the validity or importance of the task, and is simply the first step in a larger task cleanup effort. Further manual triage and/or requests for updates will happen this month for all such tickets. For more detail, have a look at the extended explanation on the main page of Traffic-Icebox . Thank you!