Instacollector for Redis v1.0.0 (#7)

Co-authored-by: Anbazhagan <anbazhag@netapp.com>

redis/README.md

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+# Instacollector_Redis - A Redis node metrics and log collector for Redis clusters
+
+Instacollector_Redis is an interactive command-line metrics collection tool for open source Redis clusters. It is       
+designed to gather diagnostic information to help review a cluster's state. As the script is interactive, input         
+parameters are not required. Options have been provided to collect metrics from the Redis nodes(via ssh) or cluster     
+stats(via redis-cli) or both(recommended).                                                                              
+
+For collecting node level metrics and conf/log files, the localhost should have ssh-private key access to all the       
+nodes in the Redis cluster. It is recommended for the ssh user to have password-less sudo access on the Redis nodes     
+to be able to collect all the required metrics. If sudo access is not available, you can still attempt collection as    
+the ssh user but we may get truncated data on some metrics. Please ensure that the ssh user has access to read the      
+Redis working directory and files in-order to be able to collect the required data. The /tmp directory will be used     
+on the Redis nodes for metrics collection. Please ensure that the /tmp directory is writable and has enough disk        
+space on all the Redis nodes(~150KB each).                                                                              
+
+For gathering cluster stats, the localhost should have redis-cli installed and setup on the system-wide PATH. If you    
+don't already have redis-cli, please ensure that you install the latest version. Only redis-cli versions 6 and above    
+have TLS support. Instructions for installation: https://redis.io/docs/getting-started/installation/                    
+The redis-cli client will be used to directly gather live metrics from the Redis cluster. Hence, please ensure that     
+the localhost has access to connect to the Redis cluster's client port(default: 6379). If TLS/SSL is enabled on Redis,  
+please ensure that the required Redis client certificate and key along with the CA certificate are locally available.   
+
+Instacollector_Redis gets the the Redis cluster connection information from the redis_cluster_nodes.list file in        
+the same directory. Please enter the IP/DNS of all the nodes in your Redis cluster in redis_cluster_nodes.list          
+before attempting a run. The file should only contain a list of either the IP or DNS of each node in the Redis          
+cluster and each IP/DNS should be on a separate line. Please refer to the file format of redis_cluster_nodes.list       
+which is available in the same directory of the git repo as an example. Please remove the existing IPs on it and add    
+the ones for you Redis cluster nodes.                                                                                   
+
+Once all the required information is provided to Instacollector_Redis, it will attempt to connect and acquire the       
+required metrics from the Redis cluster.                                                                                
+
+The Redis cluster's node metrics, conf/logs and stats are packaged into a tarball for easy consumption in the /tmp      
+directory of the localhost. Please ensure that /tmp directory is writable and has enough disk-space on the localhost.   
+Ex: For a fresh 6 node cluster the uncompressed space required would be around 1 MB on the localhost.                  
+
+