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RUM automatically aggregates error events reported by the SDK into Issues, helping you prioritize the most impactful problems, reduce service downtime, and minimize user frustration. You can inspect Issues through daily checks in the console, or configure alert notifications to be notified the moment a problem occurs. Flashduty RUM’s alerting capabilities include:
  • Alert Notifications: Deliver Issues as alert events to Flashduty channels, notifying responders through escalation rules
  • Webhook Delivery: POST Issue alerts directly to your receiver, suitable for RUM-only private deployments without On-call or for custom notification pipelines
  • Alert Grading: Customize alert priority based on error attributes such as user, page, or environment
  • Data Filtering: Filter out noise data before Errors are aggregated into Issues, reducing unnecessary alerts

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Enable Alerts

1

Enter Application Details

Go to “Application Details” - “Alert Settings” page
2

Enable Alerts

Turn on the alert switch and choose a delivery mode: Flashduty channels or Webhook
3

Configure Notification Rules

If you choose Flashduty channels, alert notification rules follow the escalation rules under the channel. You can set up responders for your team to assign alerts when they occur
4

Configure Webhook

If you choose Webhook, enter your receiver URL. Before saving, click “Send Test Event” to verify that the URL is reachable and that your receiver can parse the sample alert event
Alert Settings
You only need the On-call service when you choose Flashduty channel delivery. With Webhook delivery, RUM sends alert events directly to the URL you configure and does not create or use an On-call integration.

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Delivery Modes

The Webhook configuration area provides a “Send Test Event” button. The test sends a sample alert event to the current URL and returns the HTTP status code and result message, so you can verify network reachability and receiver parsing before saving.

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Alert Trigger Conditions

  • An Issue triggers an alert event. The actual destination depends on the delivery mode selected in Alert Settings
  • With Flashduty channel delivery, whether a notification is triggered depends on the channel’s integration config, noise reduction config, and escalation rules
  • With Webhook delivery, RUM sends the event directly to the Webhook URL. Your receiver is responsible for later notification, payload transformation, and retry behavior
  • When an Issue is closed, the system triggers a close-type alert event. If the alert is delivered through Flashduty channels, the associated incident may automatically recover

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Alert Severity

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Default Grading Rules

If no custom alert grading rules are configured, the severity of alert events triggered by Issues is automatically determined by the system:

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Custom Alert Grading

You can configure custom alert grading rules in “Alert Settings” to set alert priority (P0 / P1 / P2) based on error attributes, enabling more granular alert control. Custom grading rules are evaluated when an Error is reported, producing a “preset priority”. When the Error is aggregated into an Issue:
  • New Issue: The Issue priority is determined by the preset priority of the first Error
  • Matching existing Issue: If the Error’s preset priority is higher, the Issue priority is automatically upgraded (never downgraded)
  • No rule matched: Default priority P2 is used
Each grading rule consists of the following elements: Rules are evaluated from top to bottom in priority order; the first matching rule takes effect immediately, and subsequent rules are not checked. You can drag and drop rules to adjust their priority order.
Each application supports a maximum of 6 alert grading rules. Each rule supports up to 2 OR condition groups, each group up to 3 AND conditions, and each condition up to 8 match values.

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Supported Match Fields

Match operators support “contains” and “not contains”.

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Configuration Examples

Set the highest priority for VIP user errors to ensure immediate response:
  • Match condition: User ID contains vip
  • Alert level: P0 (Critical)
The payment page is a critical business flow; related errors need priority handling:
  • Match condition: Page URL contains /payment
  • Alert level: P1 (Warning)
Production crashes require immediate response:
  • Match condition: Environment contains production, AND Is Crash contains true
  • Alert level: P0 (Critical)
  • Issue priority can only be upgraded, never downgraded, ensuring important problems are not deprioritized by subsequent lower-priority errors
  • To adjust priority based on Issue impact (e.g., affected user count or error count), configure it in the Flashduty Alert Pipeline

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Data Filtering

Data filtering allows you to filter out unwanted noise data before Errors are aggregated into Issues. Filtered Errors will not participate in Issue aggregation or trigger alerts. You can add filter rules in “Alert Settings”. Each rule can have multiple match conditions with AND logic within the same rule. Supported match fields are the same as Custom Alert Grading.
  • Filtered Errors will not participate in Issue aggregation or alerting, but the data is still retained and can be viewed in the Explorer using filter conditions
  • If you only want to temporarily suppress certain alerts while retaining Issue data, use the “Alert Drop” feature in the Flashduty Alert Pipeline

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Integration with Flashduty

RUM alerts work in deep collaboration with Flashduty, forming a complete alert processing chain: When you choose Flashduty channel delivery, you can further process RUM alerts in the Flashduty Alert Pipeline, such as adjusting alert levels based on affected user count, suppressing repeated alerts by time window, or customizing alert title formats. When you choose Webhook delivery, RUM alerts do not enter this On-call processing chain; handle payload transformation, routing, and notification in your receiver.

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Further Reading

RUM Alert Noise Reduction

Typical scenario configurations to quickly reduce unnecessary alert noise

Alert Pipeline

Clean, transform, and filter alerts at the integration layer

Noise Reduction

Aggregate and suppress alerts at the channel level

Escalation Rules

Configure escalation rules to route alerts to the right responders