Lowercase redis command labels

[SuperQ]

💸 TL;DR

In order to make baseplate.py redis client Prometheus labels consistent with other systems / clients, lowercase the redis_command label values.

📜 Details

Design Doc

Jira

🧪 Testing Steps / Validation

✅ Checks

• [x] CI tests (if present) are passing
• [x] Adheres to code style for repo
• [ ] Contributor License Agreement (CLA) completed if not a Reddit employee

[SuperQ]

I did some simple benchmarks of this, it only adds about 50ns to the command execute. We also do a similar .lower() on HTTP calls in /baseplate/clients/requests.py.

[bjk-reddit]

Spec update has been approved and merged.

[SuperQ]

Ping, can this be merged?