Prepare 1.21.0 release (#2042)

Co-authored-by: Gergely Kalapos <[email protected]>

CHANGELOG.asciidoc

@@ -23,6 +23,24 @@ endif::[]
 [[release-notes-1.x]]
 === .NET Agent version 1.x
 
+[[release-notes-1.21.0]]
+==== 1.21.0
+
+This release includes two breaking changes that have minimal impact.
+
+- We removed support for target frameworks which have gone into end-of-life support by Microsoft.
+The impact should be minimal, however as we continue to support `netstandard2.0` and `netstandard2.1` where applicable.
+- We removed the collection of GC metrics over ETW on .NET Full Framework. The collection over ETW requires elevated privileges, especially in IIS deployments. This runs counter to best practices.
+Since these are currently not displayed in the APM UI, while technically breaking, the impact should be minimal. The GC metric collection on modern .NET platforms is not impacted.
+
+
+===== Breaking changes
+- {pull}2036[#2036] Remove ETW powered GC metrics on FullFramework
+- {pull}2027[#2027] Remove unsupported TFM's
+
+===== Bug fixes
+- {pull}2041[#2041] Prevent sending activation_method in metadata for 8.7.0 
+
 [[release-notes-1.20.0]]
 ==== 1.20.0
 

src/Directory.Build.props

@@ -3,9 +3,9 @@
   <Import Project="$([MSBuild]::GetPathOfFileAbove('Directory.Build.props', '$(MSBuildThisFileDirectory)../'))" />
   <PropertyGroup>
     <AssemblyVersion>1.21.0</AssemblyVersion>
-    <InformationalVersion>1.21.0-alpha</InformationalVersion>
+    <InformationalVersion>1.21.0</InformationalVersion>
     <FileVersion>1.21.0</FileVersion>
-    <VersionPrefix>1.21.0-alpha</VersionPrefix>
+    <VersionPrefix>1.21.0</VersionPrefix>
     <Authors>Elastic and contributors</Authors>
     <Copyright>2022 Elasticsearch BV</Copyright>
     <PackageProjectUrl>https://github.com/elastic/apm-agent-dotnet</PackageProjectUrl>

src/elastic_apm_profiler/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "elastic_apm_profiler"
-version = "1.21.0-alpha"
+version = "1.21.0"
 edition = "2018"
 authors = ["Elastic and Contributors"]
 description = "Elastic APM .NET agent CLR profiler"