Description of problem:
I have Satellite satellite-6.12.0-4.el8sat.noarch configured with:

--tuning=medium
--foreman-foreman-service-puma-threads-min=16
--foreman-foreman-service-puma-threads-max=16
--foreman-foreman-service-puma-workers=8
--foreman-db-pool=128
--foreman-proxy-plugin-remote-execution-script-install-key=true
--foreman-proxy-plugin-remote-execution-script-mode=ssh

with RHC configured. When I created playbook on RH Cloud to fix RHSA-2021:1581 (package "sqlite" update) and ran it on 8 hosts, all worked well. When I ran it on 334 hosts, ReX job on Satellite failed with:

Failed to initialize: RuntimeError - Failed rendering template: error during rendering: 400 Bad Request

I assume it is because playbook_url is too long https://satellite.example.com/job_invocations/13 -> Preview templates -> playbook_url value is:

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On RH Cloud, remediations playbook shows:

https://console.redhat.com/insights/remediations/516f4b02-8b86-437e-ad67-b80f91862548?issues
Total systems: 334 systems
Latest activity: Failed 0 passed 50 failed 0 others

(yes, numbers does not match )

On Satellite, it says:

https://f09-h26-b01-5039ms.rdu2.scalelab.redhat.com/job_invocations/13
0 passed 334 failed 0 pending 0 cancelled

Version-Release number of selected component (if applicable):
satellite-6.12.0-4.el8sat.noarch

How reproducible:
Tried once

Steps to Reproduce:
1. Have a Satellite configured for RH Cloud with 334 hosts (or so)
2. Make sure there is a errata applicable on them (in my case I have outdated "sqlite" package, upgradable via RHSA-2021:1581)
3. On RH Cloud, create remediation playbook using Patch
4. Attempt to run that playbook from RH Cloud on these 334 hosts

Actual results:
ReX job on Satellite failed with:

Failed to initialize: RuntimeError - Failed rendering template: error during rendering: 400 Bad Request

Expected results:
Playbook should upgrade these package on these hosts and RH Cloud should show correct number of passed systems.