add metrics section and update perf modules (#10209)

docs/product/index.mdx

@@ -29,20 +29,21 @@ Our performance monitoring feature helps you track application performance, meas
 - You can drill down into any slowdowns and optimize the performance of your code with [**distributed traces**](/product/sentry-basics/concepts/tracing/distributed-tracing/), which consist of transactions and spans and measure the performance of individual services and operations. This means you can easily [trace](/product/sentry-basics/concepts/tracing/trace-view/) slow-loading pages all the way back to poor-performing API calls.
 - Sentry [**Profiling**](/product/profiling/) provides code-level insights into your application performance in production so you can find and fix the problematic line of code faster. It profiles code in every environment your application is running on so you can quickly see which functions are contributing to a slow span.
 - Sentry helps you discover and act on [**trends**](/product/performance/trends/) before they become a bigger problem by surfacing transactions whose performance has changed significantly over time.
-- Sentry's [**query monitoring**](/product/performance/queries/) can help you investigate the performance of your queries and get more information to improve them.
+- Sentry provides insights to help you monitor your app's performance in various categories, including web vitals, mobile vitals, queries, HTTP requests, and more. You can drill into event samples to investigate variations in performance.
 
 ### Release Health Monitoring
 
 Giving Sentry visibility into your [**releases**](/product/releases/) makes it possible to see the moment a release starts to degrade and quickly take action. You get real-time visibility across your releases, allowing you to see core metrics like crash-free sessions, version adoption, and failure rate.
 
 Releases are integrated with the rest of Sentry so you can directly see how an error or performance issue was affected by a release, in addition to being able to resolve release-specific issues.
 
+### Metrics
+You can manually send custom [**Metrics**](/product/metrics/) to Sentry to help you track and visualize the data points that matter most to you and your team. Metrics fit seamlessly into the Sentry workflow, so you can correlate them back to traces, set up alerts for when they cross a threshold, and link them to issues to help you debug faster.
+
 ### LLM Monitoring
 
 Our [**LLM Monitoring**](/product/llm-monitoring/) feature gives you insights into your AI pipelines within the broader context of your app. When you `pip install sentry` into a project that's also using an AI provider like OpenAI, Sentry will automatically pick up useful metrics like token usage, prompts, and model IDs, and send them to our LLM Monitoring dashboard.
 
-
-
 ### Recurring Job Monitoring
 
 [**Cron Monitors**](/product/crons/) allows you to monitor the uptime and performance of any scheduled, recurring job in Sentry. Once implemented, it'll allow you to get alerts and metrics to help you solve errors, detect timeouts, and prevent disruptions to your service.