Which attribute must be present in all filter rules in AEM dispatcher configuration?

The /glob attribute is mandatory for all filter rules in the dispatcher configuration. It specifies a

pattern that is matched against the incoming request URL. If the pattern matches, the rule is applied.

The /glob attribute can use wildcards (*) and placeholders ($1, $2, etc.) to match parts of the URL.

Reference: https://experienceleague.adobe.com/docs/experience-managerdispatcher/using/configuring/dispatcher-configuration.html?lang=en#filter-rules