Issue
I want to know why an Error Message inbound filter based on the event title (from the event JSON or issue UI) does not drop matching errors.
Applies To
All SaaS Customers
Inbound Filters
Error Message filter
Symptoms
Synthetic errors are not filtered when you match on their title
The title string does not match
{exception.type}: {exception.value}
Resolution
The Error Message filter matches {exception.type}: {exception.value} (or the formatted message for message events) when the event is ingested. It doesn’t match every string that appears in the issue title.
For synthetic exceptions, Sentry may generate the title from the function name in the top stack frame. That title isn’t what the Error Message filter uses. To check whether this is happening, look at the event JSON for exception.values[0].mechanism.synthetic set to true. If it is, filter using the exception type and/or value with a glob, such as *MyError*, rather than the synthetic title.
Also, keep in mind that filters run before symbolication and similar processing. So the filter needs to match the exception fields as they were ingested, not a title that gets rewritten later.
Details: Error Message inbound filters
Setup checklist: How can I configure inbound filters by message?