Why Are My Events Grouped or Separated Incorrectly in Sentry?

Issue

I see errors in Sentry either grouped incorrectly under the same issue or the same event separated into different issues even though they seem related.

Applies To

• All SaaS Users
• Error Monitoring
• Grouping / Fingerprinting

Symptoms

• Different errors grouped together despite having different attributes like titles
• Related errors separated into different issues

Resolution

Sentry uses event "fingerprint" to group events into issues. Events with the same fingerprint are grouped into the same issue. By default, the grouping algorithm prioritises:

• • Stack trace first
  • Exception next
  • Message last 

You can see the information used to group each issue by scrolling to the bottom of the issue details page and clicking on "Show Details" next to "Event Grouping Information":

The default grouping behaviour can be customised using one of the following options

• • SDK Configuration: 
    • Take a look at the SDK Fingerprinting documentation page and the documentation specific to your SDK
  • Project Settings:
    • Fingerprint rules
    • Stack trace rules

The full documentation on issue grouping is available here.