change suffixes from _count to _total

[drrev]

Summary

This PR addresses a naming issue with RT metrics introduced in #189:

Old	New
bot_challenges_verification_api_duplicate_count	bot_challenges_verification_api_duplicate_total
bot_challenges_verification_api_expired_count	bot_challenges_verification_api_expired_total
bot_challenges_verification_api_failure_count	bot_challenges_verification_api_failure_total
bot_challenges_verification_api_success_count	bot_challenges_verification_api_success_total
compute_cache_operations_count	compute_cache_operations_total
ddos_protection_requests_allow_count	ddos_protection_requests_allow_total
ddos_protection_requests_detect_count	ddos_protection_requests_detect_total
ddos_protection_requests_mitigate_count	ddos_protection_requests_mitigate_total
object_storage_class_a_operations_count	object_storage_class_a_operations_total
object_storage_class_b_operations_count	object_storage_class_b_operations_total
request_collapse_unusable_count	request_collapse_unusable_total
request_collapse_usable_count	request_collapse_usable_total

[SuperQ]

Thanks!