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Generate Metrics from Ingested Logs

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Datadog’s Logging without Limits* lets you dynamically decide what to include or exclude from your indexes. Log-based metrics are a cost-efficient way to summarize log data from the entire ingest stream. This means that even if you use exclusion filters to limit indexes to operationally critical logs, you can still visualize trends and anomalies over all of your log data at full granularity for 15 months.

With log-based metrics, you can record a count of logs that match a query or summarize a numeric value contained in a log, such as request duration.

Generate a log-based metric

To generate a new log-based metric, go to the Configuration page of your Datadog account and select the Generate Metrics tab, then the New Metric+ button.

Add a new log-based metric

  1. Input a query to filter the log stream: The query syntax is the same as for the Log Explorer Search. Only logs ingested with a timestamp within the past 20 minutes are considered for aggregation.
  2. Select the field you would like to track: Select * to generate a count of all logs matching your query or enter a log attribute (e.g., @network.bytes_written) to aggregate a numeric value and create its corresponding count, min, max, sum, and avg aggregated metrics.
  3. Add dimensions to group by: Select log attributes or tag keys to apply to the generated log-based metric to transform them into Tags following the <KEY>:<VALUE> format. Log-based metrics are considered custom metrics. Avoid grouping by unbounded or extremely high cardinality attributes like timestamps, user IDs, request IDs, or session IDs to avert impacting your billing.
  4. Name your metric: Log-based metric names must follow the naming metric convention.

Note: Data points for Log-based metrics are generated at ten second intervals.

Update a log-based metric

After a metric is created, only these fields can be updated:

  • Stream filter query
  • Aggregation groups

To change the metric type or name, a new metric must be created.


Datadog would love to receive your feedback on this feature. You can submit your feedback directly from this form.

Further Reading

*Logging without Limits is a trademark of Datadog, Inc.