fix: pass redis SSL config to connection pool

[tarvip]

What this PR does

This fix will pass SSL config properly to redis connection pool.
django-redis passes CONNECTION_POOL_KWARGS and not CONNECTION_POOL_CLASS_KWARGS to connection pool class, related django-redis code can be seen here.

Also, without this fix other settings max_connections and timeout are also not passed to connection pool.

I had issues with external Redis with in-transit encryption enabled using self-signed certs (Google managed Redis).
After changing this I can properly pass self-signed CA cert to redis client using REDIS_SSL_CA_CERTS env variable.

Which issue(s) this PR closes

There is no issue created for this problem.

Checklist

• Unit, integration, and e2e (if applicable) tests updated
• Documentation added (or pr:no public docs PR label added if not required)
• Added the relevant release notes label (see labels prefixed w/ release:). These labels dictate how your PR will
  show up in the autogenerated release notes.

[CLAassistant]

All committers have signed the CLA.

[JNKielmann]

We are running into the same problem trying to use oncall with a Redis on GCP with in-transit encryption enabled.

[tarvip]

We are running into the same problem trying to use oncall with a Redis on GCP with in-transit encryption enabled.

We have Grafana OnCall deployed using a Helm chart. As a workaround, I added the following env variable:

env:
  - name: REDIS_URI
    value: "$(REDIS_PROTOCOL)://$(REDIS_USERNAME):$(REDIS_PASSWORD)@$(REDIS_HOST):$(REDIS_PORT)/$(REDIS_DATABASE)?ssl_ca_certs=/mnt/redis-tls/server_ca.pem"

Redis CA cert is mounted to /mnt/redis-tls/server_ca.pem.

It would be nice to get this merged. Created this PR almost a month ago, no feedback so far.

[github-actions]

This pull request has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in 30 days if no further activity occurs. Please feel free to give a status update now, ping for review, or re-open when it's ready. Thank you for your contributions!

[github-actions]

This pull request has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in 30 days if no further activity occurs. Please feel free to give a status update now, ping for review, or re-open when it's ready. Thank you for your contributions!