.. _envoy_api_file_envoy/config/health_checker/redis/v2/redis.proto: Redis ===== Redis health checker :ref:`configuration overview `. .. _envoy_api_msg_config.health_checker.redis.v2.Redis: config.health_checker.redis.v2.Redis ------------------------------------ `[config.health_checker.redis.v2.Redis proto] `_ .. code-block:: json { "key": "..." } .. _envoy_api_field_config.health_checker.redis.v2.Redis.key: key (`string `_) If set, optionally perform ``EXISTS `` 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.