Sidekiq warning: Job arguments to *Worker do not serialize to JSON safely

Summary

After updating my self-hosted GitLab instance from 14.7.1 to 14.8.2, I'm seeing messages like this a few times an hour in /var/log/gitlab/gitlab-rails/sidekiq_client.log:

Job arguments to FileHookWorker do not serialize to JSON safely. This will raise an error in
Sidekiq 7.0. See https://github.com/mperham/sidekiq/wiki/Best-Practices or raise an error today
by calling `Sidekiq.strict_args!` during Sidekiq initialization.

Job arguments to ProjectCacheWorker do not serialize to JSON safely. This will raise an error in
Sidekiq 7.0. See https://github.com/mperham/sidekiq/wiki/Best-Practices or raise an error today
by calling `Sidekiq.strict_args!` during Sidekiq initialization.

Job arguments to ProjectServiceWorker do not serialize to JSON safely. This will raise an error in
Sidekiq 7.0. See https://github.com/mperham/sidekiq/wiki/Best-Practices or raise an error today
by calling `Sidekiq.strict_args!` during Sidekiq initialization.

Job arguments to Ci::Minutes::UpdateProjectAndNamespaceUsageWorker do not serialize to JSON safely. This will raise an error in
Sidekiq 7.0. See https://github.com/mperham/sidekiq/wiki/Best-Practices or raise an error today
by calling `Sidekiq.strict_args!` during Sidekiq initialization.

Job arguments to ExternalServiceReactiveCachingWorker do not serialize to JSON safely. This will raise an error in
Sidekiq 7.0. See https://github.com/mperham/sidekiq/wiki/Best-Practices or raise an error today
by calling `Sidekiq.strict_args!` during Sidekiq initialization.

Job arguments to MergeRequests::UpdateHeadPipelineWorker do not serialize to JSON safely. This will raise an error in
Sidekiq 7.0. See https://github.com/mperham/sidekiq/wiki/Best-Practices or raise an error today
by calling `Sidekiq.strict_args!` during Sidekiq initialization.

Job arguments to RepositoryUpdateRemoteMirrorWorker do not serialize to JSON safely. This will raise an error in
Sidekiq 7.0. See https://github.com/mperham/sidekiq/wiki/Best-Practices or raise an error today
by calling `Sidekiq.strict_args!` during Sidekiq initialization.

Job arguments to Epics::NewEpicIssueWorker do not serialize to JSON safely. This will raise an error in
Sidekiq 7.0. See https://github.com/mperham/sidekiq/wiki/Best-Practices or raise an error today
by calling `Sidekiq.strict_args!` during Sidekiq initialization.

What is the current bug behavior?

AFAIK this isn't immediately causing problems, just logging a warning.

What is the expected correct behavior?

Not logging this warning. Just wanted to make sure the GitLab developers were aware of this issue, since it will eventually become an error.

Output of checks

Results of GitLab environment info

Expand for output related to GitLab environment info

System information
System:
Proxy:          no
Current User:   git
Using RVM:      no
Ruby Version:   2.7.5p203
Gem Version:    3.1.4
Bundler Version:2.1.4
Rake Version:   13.0.6
Redis Version:  6.2.6
Sidekiq Version:6.4.0
Go Version:     unknown

GitLab information
Version:        14.8.2-ee
Revision:       20a7fdf52c9
Directory:      /opt/gitlab/embedded/service/gitlab-rails
DB Adapter:     PostgreSQL
DB Version:     12.7
URL:            https://b33p.net
HTTP Clone URL: https://b33p.net/some-group/some-project.git
SSH Clone URL:  git@b33p.net:some-group/some-project.git
Elasticsearch:  yes
Geo:            no
Using LDAP:     no
Using Omniauth: yes
Omniauth Providers:

GitLab Shell
Version:        13.23.2
Repository storage paths:
- default:      /var/opt/gitlab/git-data/repositories
GitLab Shell path:              /opt/gitlab/embedded/service/gitlab-shell

Results of GitLab application Check

Expand for output related to the GitLab application check

root@gitlab-lx 2 ~ -> gitlab-rake gitlab:check SANITIZE=true
Checking GitLab subtasks ...
Checking GitLab Shell ...
GitLab Shell: ... GitLab Shell version >= 13.23.2 ? ... OK (13.23.2)
Running /opt/gitlab/embedded/service/gitlab-shell/bin/check
Internal API available: OK
Redis available via internal API: OK
gitlab-shell self-check successful
Checking GitLab Shell ... Finished
Checking Gitaly ...
Gitaly: ... default ... OK
Checking Gitaly ... Finished
Checking Sidekiq ...
Sidekiq: ... Running? ... yes
Number of Sidekiq processes (cluster/worker) ... 1/1
Checking Sidekiq ... Finished
Checking Incoming Email ...
Incoming Email: ... Checking Reply by email ...
IMAP server credentials are correct? ... Checking gitlabincoming
yes
Mailroom enabled? ... skipped
MailRoom running? ... skipped
Checking Reply by email ... Finished
Checking Incoming Email ... Finished
Checking LDAP ...
LDAP: ... LDAP is disabled in config/gitlab.yml
Checking LDAP ... Finished
Checking GitLab App ...
Database config exists? ... yes
All migrations up? ... yes
Database contains orphaned GroupMembers? ... no
GitLab config exists? ... yes
GitLab config up to date? ... yes
Log directory writable? ... yes
Tmp directory writable? ... yes
Uploads directory exists? ... yes
Uploads directory has correct permissions? ... yes
Uploads directory tmp has correct permissions? ... yes
Systemd unit files or init script exist? ... skipped (omnibus-gitlab has neither init script nor systemd units)
Systemd unit files or init script up-to-date? ... skipped (omnibus-gitlab has neither init script nor systemd units)
Projects have namespace: ...
62/538 ... yes
77/1262 ... yes
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108/1560 ... yes
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109/1563 ... yes
101/1564 ... yes
62/1565 ... yes
Redis version >= 5.0.0? ... yes
Ruby version >= 2.7.2 ? ... yes (2.7.5)
Git user has default SSH configuration? ... yes
Active users: ... 9
Is authorized keys file accessible? ... yes
GitLab configured to store new projects in hashed storage? ... yes
All projects are in hashed storage? ... yes
Elasticsearch version 7.x (6.4 - 6.x deprecated to be removed in 13.8)? ... yes (7.17.0)
Checking GitLab App ... Finished
Checking GitLab subtasks ... Finished