Important bug fixes for leadership election and for Swagger!

What's Changed

• Fix some usages of HttpChain.RequestType after filling it with System.Void as default value by @haefele in #847
• Set health check timestamp to utc by @Hobbs1210 in #849

New Contributors

• @Hobbs1210 made their first contribution in #849

Full Changelog: V2.6.0...V2.6.1