Merge pull request #4394 from platformsh/contprof-java

Document Java continous profiling support

Author: flovntp

sites/upsun/src/increase-observability/application-metrics/java.md

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+---
+title: Continuous profiling for Java
+sidebarTitle: "Java continuous profiler"
+description: Configure and use the Java continuous profiler.
+weight: 30
+---
+
+{{< vendor/name >}} [Continuous Profiler](/increase-observability/application-metrics/cont-prof.md) is powered by [Blackfire](../../../increase-observability/application-metrics/blackfire.md).
+It is available directly the [Console](/administration/web/_index.md), under the **Profiling** tab of your environments.
+
+The Java continuous profiling is currently made across 3 dimensions:
+- **CPU Time**:  Time spent running on the CPU
+- **Allocations**: Time spent running on the CPU
+- **Allocated Memory**: Number of bytes allocated
+
+The default sampling frequency is 100 Hz. This means the Java continuous profiler is
+collecting information 100 times per second.
+
+## Prerequisites
+
+{{< vendor/name >}} Continuous Profiler requires [`Java >= 17`](/languages/java.md).
+
+## Configuration
+
+The Java continuous profiler is enabled by default without configuration.