Using Tooling API or Metadata API, an administrator with the Customize Application permission can configure a complex filter expression that contains multiple fields.
The filter expression is associated with a custom channel and is included in a channel member. You can add one or more filter expressions via channel members to a custom channel. For more information about channels and their allocations, see Group Platform Events into One Stream with a Custom Channel.
The filter expression format is based on SOQL and supports a subset of SOQL operators and field types. The filter expression can contain one or more field expressions, joined by a logical operator.
Keep these considerations in mind for the fields in a filter expression.
Event Delivery Usage for Filtered Streams
The event delivery allocation applies to the number of events delivered after the filter is applied and not before filtering. Because a filter can reduce the number of events delivered to a subscriber, using a filter helps lower a subscriber’s usage of the event delivery allocation.
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