# Use The Data Latency Page

## Objective

Review measured processing latency by data stream and check whether webhook errors may be contributing to delays.

## Environment

- You can open **Data Latency** in **Settings**.

## Resolution

1. Open **Settings** and select **Data Latency**. Select **Refresh** for current telemetry, or open the information icon beside the title to see the last telemetry update and sampling details.
2. Compare the **Messaging Volume**, **Talk Volume**, **Support Volume**, **Agents**, **SLA**, and **CSAT** cards. **AVG** is the average latency; **P50**, **P75**, and **P95** show the median, 75th percentile, and 95th percentile; **MAX** is the highest measured latency in the summary.
3. In the trend chart, choose the **Data Streams**, **Metric**, **Interval**, and **Time Period** you want to compare. Use the dashed 5-second line as a visual reference. These chart controls do not change the **Stream Details** time period.
4. In **Stream Details**, choose its **Time Period**, compare the latency metrics, **Samples**, and **Last Bucket**, and expand a stream for its detailed rows. This period is separate from the chart and summary cards, so their values may differ. Select **Export CSV** if you need the displayed detail outside **ZenOps**.
5. Under **Webhook Reliability**, review **Webhook Errors** by webhook and time window. Expand a row to see the status breakdown, and use **Trend Window** to compare error rates over time.
6. If a stream slows down, compare its trend with webhook errors for the same period. Note the stream, time period, P95, Samples, Last Bucket, and any error statuses when you investigate further.

> Canonical page: https://zenops.cx/help/articles/use-the-data-latency-page/
> Audience: For administrators and managers
> Summary: Compare stream processing latency and webhook errors from the Data Latency page.

## Notes on this article

### Note: Telemetry is sampled

After step 2 in resolution. Samples counts recorded latency observations. It is not the total number of source events, and the sampled share differs by stream.

## Visual references

- Data Latency summary cards and the stream trend chart. The chart has its own stream, metric, interval, and time-period controls.: [Data Latency page with six stream summary cards and a trend chart for selected data streams.](https://zenops.cx/help/assets/realtime-data-latency-overview.png)
- Stream Details and Webhook Reliability show latency samples, last buckets, error counts, and error-rate trends.: [Stream Details table above the Webhook Errors summary and error-rate trend chart.](https://zenops.cx/help/assets/realtime-data-latency-details.png)