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Docs: Add capture_timeout option (#85340)

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docs/sources/setup-grafana/configure-grafana/_index.md
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@ -1652,6 +1652,11 @@ For more information about screenshots, refer to [Images in notifications]({{< r
Enable screenshots in notifications. This option requires a remote HTTP image rendering service. Please see `[rendering]` for further configuration options.
### capture_timeout
The timeout for capturing screenshots. If a screenshot cannot be captured within the timeout then the notification is sent without a screenshot.
The maximum duration is 30 seconds. This timeout should be less than the minimum Interval of all Evaluation Groups to avoid back pressure on alert rule evaluation.
### max_concurrent_screenshots
The maximum number of screenshots that can be taken at the same time. This option is different from `concurrent_render_request_limit` as `max_concurrent_screenshots` sets the number of concurrent screenshots that can be taken at the same time for all firing alerts where as concurrent_render_request_limit sets the total number of concurrent screenshots across all Grafana services.