Mark .NET runtime metrics as stable (#1609)

Co-authored-by: Liudmila Molkova <limolkova@microsoft.com>

.chloggen/stable-dotnet-runtime-metrics.yaml

@@ -0,0 +1,22 @@
+# Use this changelog template to create an entry for release notes.
+#
+# If your change doesn't affect end users you should instead start
+# your pull request title with [chore] or use the "Skip Changelog" label.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the area of concern in the attributes-registry, (e.g. http, cloud, db)
+component: dotnet
+
+# A brief description of the change. Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Mark .NET runtime metrics as stable
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+# The values here must be integers.
+issues: [1602]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:

docs/attributes-registry/dotnet.md

@@ -12,16 +12,16 @@ This document defines .NET related attributes.
 
 | Attribute | Type | Description | Examples | Stability |
 |---|---|---|---|---|
-| <a id="dotnet-gc-heap-generation" href="#dotnet-gc-heap-generation">`dotnet.gc.heap.generation`</a> | string | Name of the garbage collector managed heap generation. | `gen0`; `gen1`; `gen2` | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
+| <a id="dotnet-gc-heap-generation" href="#dotnet-gc-heap-generation">`dotnet.gc.heap.generation`</a> | string | Name of the garbage collector managed heap generation. | `gen0`; `gen1`; `gen2` | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
 
 ---
 
 `dotnet.gc.heap.generation` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.
 
 | Value  | Description | Stability |
 |---|---|---|
-| `gen0` | Generation 0 | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
-| `gen1` | Generation 1 | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
-| `gen2` | Generation 2 | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
-| `loh` | Large Object Heap | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
-| `poh` | Pinned Object Heap | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
+| `gen0` | Generation 0 | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
+| `gen1` | Generation 1 | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
+| `gen2` | Generation 2 | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
+| `loh` | Large Object Heap | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
+| `poh` | Pinned Object Heap | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |