# Sampling


## What is Sampling?
Sampling allows you to control what percentage of incoming reports are accepted and stored for each report type. Rather than collecting every single report — which can be very high volume for busy sites — you can instruct Report URI to keep only a fraction of them.

Reports that are discarded by sampling appear as **Sampled** in your [Usage Metrics](https://report-uri.com/account/) and count differently towards your monthly quota.


## Default Sample Rates
All report types default to 100% sampling, meaning every report is accepted. Two report types are natively downsampled by default:

| Report Type    | Default Rate | Reason                                                                      |
|----------------|--------------|-----------------------------------------------------------------------------|
| CSP Wizard     | 1%           | The Wizard is used for initial policy discovery and generates high volumes  |
| CSP Integrity  | 10%          | Integrity checks produce frequent reports and a sample is sufficient        |
| All others     | 100%         | All reports accepted by default                                             |


## Configuring Sampling
You can adjust the sampling rate for each report type in the [Filters](https://report-uri.com/account/filters/) section of your account. Click the **Configure** button in the **Report Sampling Rates** panel to open the configuration modal.


Each report type has a slider and a numeric input that accepts values between **1% and 100%**:

- **100%** — all reports are accepted (sampling disabled)
- **50%** — approximately half of reports are accepted at random
- **1%** — only 1 in every 100 reports is accepted


Sampling is applied randomly on a per-report basis. When a report arrives, a random number is compared against your configured rate — if the report falls outside the percentage you have set, it is discarded and recorded as Sampled.


## Quota Impact
Sampled reports are treated differently to other discarded reports:

- **Only 25% of reports discarded by sampling count against your monthly quota**

This means you can significantly reduce your stored report volume using sampling while also reducing your quota consumption. This makes sampling particularly useful for high-volume report types where you only need a representative sample rather than every individual report.


## Viewing Sampled Reports
You can see how many reports are being sampled in the **Usage Metrics** table on your [account dashboard](https://report-uri.com/account/). The **Sampled** column shows the number of reports discarded by sampling for each report type, alongside your Accepted, Filtered and Rejected counts.