Add metrics for translations

[pglass]

What was changed

• Add translation success metric: temporal_s2s_proxy_translation_success{kind="", message_type=""}
• Add translation error metric: temporal_s2s_proxy_translation_error{kind="", message_type=""}

Labels:

• kind: The kind of translation. One of namespace, search-attribute, or utf8repair (or possibly others added in the future)
• message_type: The message type

Examples

utf8repair on one proxy

# HELP temporal_s2s_proxy_translation_success Count of message translations
# TYPE temporal_s2s_proxy_translation_success counter
temporal_s2s_proxy_translation_success{kind="utf8repair",message="*adminservice.StreamWorkflowReplicationMessagesResponse"} 160

namespace and utf8repair on another proxy

# HELP temporal_s2s_proxy_translation_success Count of message translations
# TYPE temporal_s2s_proxy_translation_success counter
temporal_s2s_proxy_translation_success{kind="namespace",message="GetNamespaceReplicationMessagesResponse"} 2
temporal_s2s_proxy_translation_success{kind="utf8repair",message="historyblob"} 18

Why?

Checklist

1. Closes

2. How was this tested:

Local manual test.

3. Any docs updates needed?

[temporal-nick]

what about message_type or msg_type instead of just "message"? I was briefly worried this was going to be like 100+ chars long

[pglass]

updated to message_type