added -w and -c options to check

bin/check-redis-info.rb

@@ -39,15 +39,51 @@ class RedisSlaveCheck < Sensu::Plugin::Check::CLI
          required: false,
          default: 'master'
 
+  option :warn,
+         short: '-w COUNT',
+         long: '--warning COUNT',
+         description: 'COUNT warning threshold for number of items in Redis list key',
+         proc: proc(&:to_i),
+         required: false
+
+  option :crit,
+         short: '-c COUNT',
+         long: '--critical COUNT',
+         description: 'COUNT critical threshold for number of items in Redis list key',
+         proc: proc(&:to_i),
+         required: false
+
   def run
     redis = Redis.new(default_redis_options)
 
-    if redis.info.fetch(config[:redis_info_key].to_s) == config[:redis_info_value].to_s
-      ok "Redis #{config[:redis_info_key]} is #{config[:redis_info_value]}"
+
+    if config[:redis_info_value] != "master"
+      if redis.info.fetch(config[:redis_info_key].to_s) == config[:redis_info_value].to_s
+        ok "Redis #{config[:redis_info_key]} is #{config[:redis_info_value]}"
+      else
+        critical "Redis #{config[:redis_info_key]} is #{redis.info.fetch(config[:redis_info_key].to_s)}!"
+      end
+
+    end
+
+    length =  case redis.type(config[:key])
+              when 'hash'
+                redis.hlen(config[:key])
+              when 'set'
+                redis.scard(config[:key])
+              else
+                redis.llen(config[:key])
+              end
+    if length >= config[:crit]
+      critical "Redis info #{config[:key]} length is above the CRITICAL limit: #{length} length / #{config[:crit]} limit"
+    elsif length >= config[:warn]
+      warning "Redis info #{config[:key]} length is above the WARNING limit: #{length} length / #{config[:warn]} limit"
     else
-      critical "Redis #{config[:redis_info_key]} is #{redis.info.fetch(config[:redis_info_key].to_s)}!"
+      ok "Redis info #{config[:key]} length (#{length}) is below thresholds"
     end
+
   rescue StandardError
     send(config[:conn_failure_status], "Could not connect to Redis server on #{redis_endpoint}")
   end
 end
+