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Update rum-synth.rst #1609

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8 changes: 4 additions & 4 deletions synthetics/test-config/rum-synth.rst
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Expand Up @@ -21,11 +21,11 @@ Splunk Synthetic Monitoring automatically collects Web Vitals for Browser tests.
- Measures loading performance by capturing the render time of the largest image or text block visible within the viewport.
* - Cumulative layout shift (CLS)
- Measures visual stability by capturing the sum of all individual layout shift scores for every unexpected layout shift that occurs during the entire lifespan of the page. A layout shift occurs any time a visible element changes its position from one rendered frame to the next. Fewer shifts are better for page stability.
* - INP (interaction to next paint)
- Measures the time from when a user first interacts with a web page to the time when the browser responds to that interaction.
* - Interaction to next paint (INP)
- Measures responsiveness by observing all user interactions on a page and capturing the longest time it takes the browser to respond to an interaction.
* - Total blocking time (TBT)
- Measures the time it takes a page to become interactive and responsive for a user.
TBT is collected from a synthetic test, while INP is collected from real user data. They are considered equivalent to each other because they measure the same metric.
TBT is considered a lab proxy for INP, when INP might not be captured. Both TBT and INP can be improved by [optimizing interactions](https://web.dev/articles/optimize-inp#optimize_interactions).

Prerequisites
===================
Expand Down Expand Up @@ -60,4 +60,4 @@ See also

* See :ref:`rum-synth-scenario`
* See :new-page:`https://web.dev/vitals/` in the Google developer documentation to learn more about Web Vitals.
* See :ref:`error-aggregates` to learn more about Tag Spotlight.
* See :ref:`error-aggregates` to learn more about Tag Spotlight.
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