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TencentDB for Redis
    Documentation

    Monitoring at One-Second Granularity

    Last updated: 2022-04-14 10:57:59

      TencentDB for Redis provides a full range of monitoring and custom alarming capabilities, including metrics such as load monitoring, access statistics, and network traffic.
      The monitoring data is collected by the agents deployed on each host and then reported to the data relay node where it is checked, summarized, and reported to the Cloud Monitor system in batches. Cloud Monitor provides data views, data query APIs, and custom alarms.

      You can log in to the Redis Console or Cloud Monitor Console to view monitoring data.

      Monitoring Data Retention Period

      Redis currently supports monitoring metrics at the 1-minute, 5-minutes, 1-hour, or 1-day granularity. For the retention period of monitoring data at each granularity, please see Use Limits.

      Descriptions of Monitoring Metrics

      Cloud Monitor provides the following monitoring metrics for TencentDB for Redis instances:

      Category Name Parameter Unit Description
      CPU CPU utilization cpu_us_min % Average CPU utilization
      Memory Memory usage storage_min MB Memory capacity actually used, including data and cache
      Content utilization storage_us_min % The ratio of the memory actually used to the total memory requested
      Keys keys_min - Total number of keys stored in an instance (first-level keys)
      Expired keys expired_keys_min - Number of keys eliminated in a time window, which corresponds to the `expired_keys` output by the `info` command
      Evicted keys evicted_keys_min - Number of keys evicted in a time window, which corresponds to the `evicted_keys` output by the `info` command
      Network Connections connections_min - Number of TCP connections to an instance
      Connection utilization connections_us_min % Proportion of used connections
      Inbound traffic in_flow_min Mb/s Private network inbound traffic
      Inbound traffic utilization in_flow_us_min % Proportion of used private network inbound traffic
      Outbound traffic out_flow_min Mb/s Private network outbound traffic
      Outbound traffic utilization out_flow_us_min % Proportion of used private network outbound traffic
      Latency Average execution latency latency_min ms Average execution latency from proxy to Redis server
      Average read latency latency_get_min ms Average execution latency of read commands from proxy to Redis server
      Average write latency latency_set_min ms Average execution latency of write command from proxy to Redis server
      Average latency of other commands latency_other_min ms Average execution latency of commands other than read and write commands from proxy to Redis server
      Request Requests qps_min requests/second QPS, i.e., command executions
      Read requests stat_get_min requests/second Read command executions
      Write requests stat_set_min requests/second Write command executions
      Other requests stat_other_min requests/second Executions of commands other than read and write commands
      Big value requests big_value_min requests/second Number of executions for which the request size exceeds 32 KB
      Response Slow queries slow_query_min - Number of slow query commands
      Read request hits stat_success_min - Number of existing read request keys, which corresponds to the `keyspace_hits` metric output by the `info` command
      Read request misses stat_missed_min - Number of non-existing read request keys, which corresponds to the `keyspace_misses` metric output by the `info` command
      Execution errors cmd_err_min - Number of command execution errors, such as when a command does not exist or a parameter is incorrect
      Read request hit rate cache_hit_ratio_min % Key hits/(key hits + key misses). This metric can reflect the situation of cache miss. When the access request quantity is 0, the value of this metric will be null

      The monitoring information of the Redis Cluster Edition can be divided into summary and shard information. The shard information does not include the network and latency metrics, while the summary information includes two additional metrics:

      Category Name Parameter Unit Description
      CPU Maximum shard CPU utilization cpu_max_us_min % The highest CPU utilization value of all shards in a cluster
      Memory Maximum shard memory utilization storage_max_us_min % The highest memory utilization value of all shards in a cluster

      Command category

      Command Category List
      Read command get,strlen,exists,getbit,getrange,substr,mget,llen,lindex,lrange,sismember,scard,srandmember,
      sinter,sunion,sdiff,smembers,sscan,zrange,zrangebyscore,zrevrangebyscore,zrangebylex,
      zrevrangebylex,zcount,zlexcount,zrevrange,zcard,zscore,zrank,zrevrank,zscan,hget,hmget,
      hlen,hstrlen,hkeys,hvals,hgetall,hexists,hscan,randomkey,keys,scan,dbsize,type,ttl,touch,pttl,
      dump,object,memory,bitcount,bitpos,georadius_ro,georadiusbymember_ro,geohash,geopos,geodist,pfcount
      Write command set,setnx,setex,psetex,append,del,unlink,setbit,bitfield,setrange,incr,decr,rpush,lpush,rpushx,
      lpushx,linsert,rpop,lpop,brpop,brpoplpush,blpop,lset,ltrim,lrem,rpoplpush,sadd,srem,smove,spop,
      sinterstore,sunionstore,sdiffstore,zadd,zincrby,zrem,zremrangebyscore,zremrangebyrank,
      zremrangebylex,zunionstore,zinterstore,hset,hsetnx,hmset,hincrby,hincrbyfloat,hdel,incrby,decrby,
      incrbyfloat,getset,mset,msetnx,swapdb,move,rename,renamenx,expire,expireat,pexpire,pexpireat,
      flushdb,flushall,sort,persist,restore,restore-asking,migrate,bitop,geoadd,georadius,georadiusbymember,
      pfadd,pfmerge,pfdebug
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