Track redirection counts within a Redis pipeline
What does this MR do and why?
This MR track redirection counts within a Redis pipeline using a histogram. For pipeline redirections, the errors are being tracked under the gitlab_redis_client_exceptions_total
counter. But they are handled in redis-cluster-client. We instrument the RedisClient
middleware but the cluster client handles pipeline redirection outside of the middleware.
See gitlab-com/gl-infra/production#17931 (comment 1891102014)
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