If the "Browser and proxy cache maximum age" setting under `/admin/config/development/performance` is set to a low value, A warning appears here: `/admin/config/development/performance/purge`that says "TTL settings under 24 hours are dangerous, as sudden traffic increases will quickly reach your webserver(s) and can make Drupal slow."

This might be misleading, since (at least) Varnish apparently caches indefinitely, so only the browser client caches content for that duration. I can see how the quoted statement may be technically correct, but it may be misleading. Since it's not possible to use the BAN request method on people's browsers, perhaps that value should be set to less than one hour to avoid people from failing to see updated information on Drupal sites.

Thanks! : )

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sudoman0 created an issue.