> ## Documentation Index
> Fetch the complete documentation index at: https://docs.upstackdata.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Data Quality Metrics: Monitor Event Match Quality and Tracking Health

> Track data quality metrics in Upstack. View 16 metrics including EMQ Score, Event Coverage, and Match Key Coverage with formulas, examples, and best practices.

Data Quality metrics measure how well your tracking setup is performing—specifically Meta's Event Match Quality (EMQ) scores that determine how accurately your conversion events match to Facebook users. Higher quality scores mean better ad targeting, more accurate attribution, and improved campaign performance.

<Info>
  **Data Source:** [Upstack Pixel](/pixel)\
  **Metrics in Category:** 16
</Info>

## Subcategories

| Subcategory                                                | Metrics | Description                                                                   |
| ---------------------------------------------------------- | ------- | ----------------------------------------------------------------------------- |
| [Event Match Quality](/reference/metrics/data-quality/emq) | 16      | Meta's EMQ scores, match key coverage, diagnostics, and deduplication metrics |

## When to Use

* **Event Match Quality:** When you need to monitor and improve your Meta Conversions API event matching, diagnose tracking issues, or optimize your customer identifier coverage for better attribution.

## All Data Quality Metrics

| Metric                                                                                   | Description                                      |
| ---------------------------------------------------------------------------------------- | ------------------------------------------------ |
| [EMQ Score](/reference/metrics/data-quality/emq/emq-score)                               | Event Match Quality score from Meta (0-10 scale) |
| [Event Coverage](/reference/metrics/data-quality/emq/event-coverage)                     | Percentage of events with valid match keys       |
| [Event Coverage Goal](/reference/metrics/data-quality/emq/event-coverage-goal)           | Target event coverage percentage from Meta       |
| [Diagnostics Count](/reference/metrics/data-quality/emq/diagnostics-count)               | Number of active diagnostic issues               |
| [Match Key Issues](/reference/metrics/data-quality/emq/match-key-issues)                 | Number of match keys with identified issues      |
| [ACR Percentage](/reference/metrics/data-quality/emq/acr-percentage)                     | Attributed Conversion Rate percentage            |
| [Coverage Potential ACR](/reference/metrics/data-quality/emq/coverage-potential-acr)     | Potential ACR improvement from event coverage    |
| [Event Potential ACR](/reference/metrics/data-quality/emq/event-potential-acr)           | Potential ACR improvement from event quality     |
| [Match Key Coverage](/reference/metrics/data-quality/emq/match-key-coverage)             | Coverage percentage for specific match keys      |
| [Expected EMQ Increase](/reference/metrics/data-quality/emq/expected-emq-increase)       | Predicted EMQ score increase from fixes          |
| [Match Key Potential ACR](/reference/metrics/data-quality/emq/match-key-potential-acr)   | Potential ACR if match key is improved           |
| [Affected Events %](/reference/metrics/data-quality/emq/affected-events-percentage)      | Percentage of events affected by issues          |
| [Affected Event Count](/reference/metrics/data-quality/emq/affected-event-count)         | Number of events affected by issues              |
| [Browser Dedupe Coverage](/reference/metrics/data-quality/emq/browser-dedupe-coverage)   | Browser events with deduplication key            |
| [Server Dedupe Coverage](/reference/metrics/data-quality/emq/server-dedupe-coverage)     | Server events with deduplication key             |
| [Overall Browser Coverage](/reference/metrics/data-quality/emq/overall-browser-coverage) | Overall browser deduplication coverage           |