[Self-Managed]: Fleet Server failed to upgrade from 8.2>8.3 on self-managed 8.3 Kibana

[amolnater-qasource]

Kibana version: 8.3 Snapshot Kibana self-managed environment

Host OS and Browser version: Windows, All

Build details:

VERSION: 8.3.0 Snapshot self-managed
BUILD: 53295
COMMIT: 6ef457053adce432a3b4d5b016997f92488d857d

Preconditions:

1. 8.3 Snapshot Kibana self-managed environment should be available.
2. Lower version 8.2.0 fleet server should be installed.

Steps to reproduce:

1. Navigate to Fleet>Agents tab.
2. Click upgrade lower version fleet server.
3. Observe after 2-3 minutes fleet server failed to upgrade to latest version.

Expected Result:
Fleet Server should upgrade to latest version on self-managed 8.3 Kibana

Logs:
elastic-agent-diagnostics-2022-06-16T11-01-48Z-00.zip

Screenshot:

Related Issue:
Elastic-Agents also failed to upgrade on cloud builds.
Issue reported at: elastic/elastic-agent#526

[manishgupta-qasource]

Secondary review for this ticket is Done

[amolnater-qasource]

Hi @jlind23
We have revalidated this issue on 8.3 Snapshot self-managed environment and found it fixed now.

• 8.2.0 Fleet Server upgraded to latest version on self-managed 8.3 Snapshot Kibana.

Screenshots:

Build details:
VERSION: 8.3.0
BUILD: 53530
COMMIT: 5c1a4d546377d12937afa10ed286adda23d60623
8.2 agent Artifact: https://artifacts.elastic.co/downloads/beats/elastic-agent/elastic-agent-8.2.0-windows-x86_64.zip

Hence we are closing this and marking as QA:Validated.
Thanks