Real User Monitoring Monitor

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Datadog’s Real User Monitoring (RUM) provides real-time visibility into individual user activity for web and mobile applications. It addresses performance tracking, error management, analytics, and support use cases.

After you enable RUM for your organization, you can create a RUM monitor to alert you when a specific RUM event type exceeds a predefined threshold over a given period of time.

Create a RUM monitor

To create a RUM monitor in Datadog, first navigate to Monitors > New Monitor > Real User Monitoring.

Note: There is a default limit of 1000 RUM monitors per account. If you are encountering this limit, consider using multi alerts, or Contact Support.

Define the search query

As you expand your search filters, the graph above the search bar updates.

  1. Construct a search query using the same logic as a RUM Explorer search.

  2. Choose to monitor over a RUM event count, facet, or measure.

    • Monitor over a RUM event count: Use the search bar (optional) and do not select a facet or measure. Datadog evaluates the number of RUM events over a selected time frame, then compares it to the threshold conditions.
    • Monitor over a facet: If you select a facet, the monitor alerts over the Unique value count of the facet.
    • Monitor over measure: If you select a measure, the monitor alerts over the numerical value of the RUM facet (similar to a metric monitor). Select an aggregation type (min, avg, sum, median, pc75, pc90, pc95, pc98, pc99, or max).
  3. Group RUM events by multiple dimensions (optional): All RUM events matching the query are aggregated into groups based on the value of up to four facets. When there are multiple dimensions, the top values are determined according to the first dimension, then according to the second dimension within the top values of the first dimension, and so on up to the last dimension. The dimensions limit depends on the total number of dimensions:

    • 1 facet: 1000 top values
    • 2 facets: 30 top values per facet (at most 900 groups)
    • 3 facets: 10 top values per facet (at most 1000 groups)
    • 4 facets: 5 top values per facet (at most 625 groups)
  4. Configure the alerting grouping strategy (optional).

    • Simple-Alert: Simple alerts aggregate over all reporting sources. You receive one alert when the aggregated value meets the set conditions. If the query has a group by and you select Simple-Alert, you get one alert when one or multiple groups values breach the threshold. You may use this strategy to reduce notification noise.
    • Multi Alert: Multiple alerts apply the alert to each source according to your group parameters. An alerting event is generated for each group that meets the set conditions. For example, you can group a query by to receive a separate alert for each browser when the number of errors is high.
    Define the search query
  5. Add multiple queries and apply formulas and functions (optional):

    • Multiple queries: Click Add Query to analyze multiple different sets of RUM data in relation to each other.
    • Formulas and functions: After adding your desired queries, click the Add Function icon to add a mathematical computation. The example below calculates the error rate on a cart page using the formula (a/b)*100.
    A monitor configured to alert on the error rate of a cart page. This monitor has two queries (a and b) and contains a formula: (a/b)*100.

Set alert conditions

An alert is triggered whenever a metric crosses a threshold.

  • Triggers when the metric is above, above or equal to, below, or below or equal to.
  • The threshold during the last 5 minutes, 15 minutes, 1 hour, or custom to set a value between 5 minutes and 48 hours.
  • Alert threshold <NUMBER>.
  • Warning threshold <NUMBER>.

No data and below alerts

To receive a notification when an application has stopped sending RUM events, set the condition to below 1. This notifies when no RUM events match the monitor query in a given time frame across all aggregate groups.

When splitting the monitor by any dimension (tag or facet) and using a below condition, the alert is triggered if and only if there are RUM events for a given group, and the count is below the threshold—or if there are no RUM events for all of the groups.

Alerting Examples

For example, this monitor triggers if and only if there are no RUM events for all applications:

The monitor configuration page with the search query left blank, set to the count of all RUM events and grouped by over the last 5 minutes. The Set alert conditions section is configured to trigger when the value is below the threshold of 1, and if data is missing for more than 5 minutes it is configured to evaluate as zero

And this monitor triggers if there are no logs for the application

The monitor configuration page with Application Id:Shopist entered in the search query, set to the count of all RUM events matching that application over the last 5 minutes. The Set alert conditions section is configured to trigger when the value is below the threshold of 1, and if data is missing for more than 5 minutes it is configured to evaluate as zero

Advanced alert conditions

For more information about advanced alert options such as evaluation delay, see Configure Monitors.


For more information about the Configure notifications and automations section, see Notifications.

Further Reading