package envoy.extensions.health_checkers.redis.v3
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message
redis.proto:18string key = 1
If set, optionally perform ``EXISTS <key>`` instead of ``PING``. A return value from Redis of 0 (does not exist) is considered a passing healthcheck. A return value other than 0 is considered a failure. This allows the user to mark a Redis instance for maintenance by setting the specified key to any value and waiting for traffic to drain.