Amazon ElastiCache Redis Monitoring

Overview

Amazon ElastiCache for Redis is a fully managed, in-memory caching service that supports real-time applications with sub-millisecond latency. It is commonly used for caching, session management, real-time analytics, and message brokering.

Applications Manager’s ElastiCache Redis monitoring tool provides visibility into the performance, memory utilization, replication health, and command-level statistics of your Redis cache nodes. Monitoring these metrics enables administrators to identify cache bottlenecks, optimize memory usage, and ensure high availability of their caching layer.

Creating a new ElastiCache Redis monitor

To learn how to create a new ElastiCache Redis monitor, refer here.

Monitored parameters

Go to the Monitors Category View by clicking the Monitors tab. Click on the ElastiCache Redis instance available under Amazon in the Cloud Apps section. Displayed is the ElastiCache Redis bulk configuration view distributed into three tabs:

Availability tab shows the availability history for the past 24 hours or 30 days.
Performance tab shows health status and events for the past 24 hours or 30 days.
List view tab enables you to perform bulk admin configurations.

By clicking a monitor from the list, you’ll be taken to the Amazon ElastiCache Redis dashboard which includes the following tabs:

Performance Overview
Network & Replication
Command Statistics
Configuration

Performance Overview

Parameter	Description
CLUSTER INFORMATION
Cache Status	The current status of the ElastiCache Redis cluster node.
Node Type	The instance type of the ElastiCache Redis cache node.
Engine Version	The version of the Redis engine running on the cache node.
Endpoint Address	The DNS hostname of the cache node endpoint.
Endpoint Port	The port number of the cache node endpoint.
Is Master	The status indicating whether the ElastiCache Redis node is the primary node of the current shard/cluster at the time of polling.
Save In Progress	The status indicating whether there is an ongoing background save on the ElastiCache Redis cache node at the time of polling.
PERFORMANCE
CPU Utilization	The average CPU Utilization of the ElastiCache Redis cache node at the time of polling (in %).
Engine CPU Utilization	The average Engine CPU Utilization dedicated to the Redis engine at the time of polling (in %).
Cache Hit Rate	The average Cache Hit Rate (percentage of successful read-only key lookups) on the ElastiCache Redis cache node between the poll interval (in %).
DATABASE UTILIZATION
Database Memory Utilization	The average Database Memory Utilization percentage of total memory in use on the ElastiCache Redis cluster at the time of polling (in %).
Database Memory Utilization (Evict)	The average Database Memory Utilization (Evict) percentage of total memory in use, counted for eviction policy decisions, on the ElastiCache Redis cluster at the time of polling (in %).
Database Capacity Utilization	The average Database Capacity Usage percentage of total data capacity in use on the ElastiCache Redis cluster at the time of polling (in %).
Database Capacity Utilization (Evict)	The average Database Capacity Utilization (Evict) percentage of total data capacity in use, excluding overhead and COB, on the ElastiCache Redis cluster at the time of polling (in %).
CPU CREDITS
CPU Credit Balance	The average CPU Credit Balance of the ElastiCache Redis cache node at the time of polling.
CPU Credit Usage	The average CPU Credit Usage of the ElastiCache Redis cache node at the time of polling.
FREE MEMORY
Free Memory	The average Freeable Memory available on the ElastiCache Redis cache node at the time of polling (in MB).
SWAP USAGE
Swap Usage	The average Swap Usage on the ElastiCache Redis cache node at the time of polling (in MB).
CACHE DATA USED
Cache Data Used	The average Cache Data Used (allocated by Redis for all purposes including dataset and buffers) on the ElastiCache Redis cache node at the time of polling (in MB).
MEMORY FRAGMENTATION
Active Defrag Hits	The total number of Active Defrag Hits (value reallocations per minute by the active defragmentation process) on the ElastiCache Redis cache node between the poll interval.
Memory Fragmentation Ratio	The average Memory Fragmentation Ratio of memory allocated by the OS to memory requested by Redis on the ElastiCache Redis cache node between the poll interval.
CACHE PERFORMANCE
Cache Hits	The total number of Cache Hits (successful read-only key lookups in the main dictionary) on the ElastiCache Redis cache node between the poll interval.
Cache Misses	The total number of Cache Misses (unsuccessful read-only key lookups in the main dictionary) on the ElastiCache Redis cache node between the poll interval.
KEYS EVICTED
Keys Evicted	The total number of Keys Evicted due to the maxmemory limit on the ElastiCache Redis cache node between the poll interval.
KEY EXPIRATION EVENTS
Key Expiration Events	The total number of Key Expiration Events on the ElastiCache Redis cache node between the poll interval.
CURRENT ITEMS
Current Items	The average number of Current Items in the ElastiCache Redis cache between the poll interval.
Current Volatile Items	The average number of Current Volatile Items (keys with a TTL set across all databases) in the ElastiCache Redis cache between the poll interval.
DB0 TIME TO LIVE
DB0 Time To Live	The average DB0 Time To Live for keys in DB0 of the ElastiCache Redis cache node between the poll interval (in ms).
KEYS TRACKED
Keys Tracked	The total number of Keys Tracked by Redis key tracking on the ElastiCache Redis cache node between the poll interval.
CONNECTIONS
Current Connections	The average number of Current Connections (client connections, excluding read replicas) on the ElastiCache Redis cache node between the poll interval.
New Connections	The average number of New Connections accepted by the ElastiCache Redis server between the poll interval.
AUTHENTICATION & AUTHORIZATION FAILURES
Authentication Failures	The average number of Authentication Failures (failed AUTH command attempts) on the ElastiCache Redis instance between the poll interval.
Command Authorization Failures	The average number of Command Authorization Failures (failed calls to run unpermitted commands) on the ElastiCache Redis cache node between the poll interval.
Key Authorization Failures	The average number of Key Authorization Failures (failed attempts to access unpermitted keys) on the ElastiCache Redis cache node between the poll interval.
Channel Authorization Failures	The average number of Channel Authorization Failures (failed attempts to access unpermitted channels) on the ElastiCache Redis cache node between the poll interval.
IAM AUTHENTICATION
IAM Authentication Expirations	The total number of IAM Authentication Expirations (expired IAM-authenticated connections) on the ElastiCache Redis cache node between the poll interval.
IAM Authentication Throttling	The total number of IAM Authentication Throttling events (throttled IAM-authenticated AUTH or HELLO requests) on the ElastiCache Redis cache node between the poll interval.

Network & Replication

Parameter	Description
PRIMARY LINK HEALTH STATUS
Primary Link Health Status	The Primary Link Health Status of the connection to the primary node on the ElastiCache Redis cache node at the time of polling.
Traffic Management Active	The Traffic Management Active status indicating whether ElastiCache is actively managing traffic on the ElastiCache Redis cache node at the time of polling.
REPLICATION LAG
Replication Lag	The average Replication Lag (time in seconds the replica is behind the primary node) of the ElastiCache Redis cache node between the poll interval (in s).
DATA REPLICATED
Data Replicated	The average Data Replicated (data sent from the primary node to all replicas) on the ElastiCache Redis cache node between the poll interval (in MB).
GLOBAL DATASTORE REPLICATION LAG
Global Datastore Replication Lag	The average Global Datastore Replication Lag between the secondary Region primary node and the primary Region primary node on the ElastiCache Redis cache node between the poll interval (in s).
NETWORK ALLOWANCE EXCEEDED
Inbound Bandwidth Limit Exceeded	The average Inbound Bandwidth Limit Exceeded (packets shaped because inbound bandwidth exceeded the maximum) on the ElastiCache Redis cache node between the poll interval.
Outbound Bandwidth Limit Exceeded	The average Outbound Bandwidth Limit Exceeded (packets shaped because outbound bandwidth exceeded the maximum) on the ElastiCache Redis cache node between the poll interval.
Connection Limit Exceeded	The average Network Connection Tracking Allowance Exceeded on the ElastiCache Redis cache node between the poll interval.
Packet Rate Limit Exceeded	The average Network Packets Per Second Allowance Exceeded on the ElastiCache Redis cache node between the poll interval.
NETWORK TRAFFIC
Incoming Traffic	The rate of data the host has read from the network per minute on the ElastiCache Redis cache node between the poll interval (in MB/min).
Outgoing Traffic	The rate of data the host has written to the network per minute on the ElastiCache Redis cache node between the poll interval (in MB/min).
NETWORK PACKETS
Packets Received	The rate of packets received on all network interfaces per minute on the ElastiCache Redis cache node between the poll interval (in packets/min).
Packets Transmitted	The rate of packets sent on all network interfaces per minute on the ElastiCache Redis cache node between the poll interval (in packets/min).
NETWORK PEAK THROUGHPUT
Peak Incoming Traffic	The maximum amount of data received per second on the ElastiCache Redis cache node between the poll interval (in MB/s).
Peak Outgoing Traffic	The maximum amount of data sent per second on the ElastiCache Redis cache node between the poll interval (in MB/s).
NETWORK PEAK PACKETS
Peak Incoming Packets	The maximum number of packets received per second on the ElastiCache Redis cache node between the poll interval (in packets/s).
Peak Outgoing Packets	The maximum number of packets sent per second on the ElastiCache Redis cache node between the poll interval (in packets/s).
DISK THROUGHPUT
Disk Data Read	The rate of data read from disk per minute on the ElastiCache Redis cache node between the poll interval (in MB/min).
Disk Data Write	The rate of data written to disk per minute on the ElastiCache Redis cache node between the poll interval (in MB/min).
DISK ITEMS
Disk Items Read	The rate of items read from disk per minute on the ElastiCache Redis cache node between the poll interval (in items/min).
Disk Items Write	The rate of items written to disk per minute on the ElastiCache Redis cache node between the poll interval (in items/min).

Note:Network & Replication tab metrics are disabled from data collection by default and mapped under performance polling as Network & Replication. To enable data collection, navigate to Settings → Performance Polling, select the Optimize Data Collection tab, choose Amazon ElastiCache Redis as the monitor type and Network & Replication as the metric name, then set the preferred time interval.

Command Statistics

Parameter	Description
READ/WRITE COMMAND LATENCY
Get Type commands Latency	The average Get Type commands Latency (read-only type commands) on the ElastiCache Redis cache node between the poll interval (in microseconds).
Set Type commands Latency	The average Set Type commands Latency (write type commands) on the ElastiCache Redis cache node between the poll interval (in microseconds).
Key Based commands Latency	The average Key Based commands Latency on the ElastiCache Redis cache node between the poll interval (in microseconds).
Non Key Type commands Latency	The average Non Key Type commands Latency on the ElastiCache Redis cache node between the poll interval (in microseconds).
READ/WRITE COMMAND USAGE
Get Type Cmds	The total number of Get Type commands (read-only type commands) on the ElastiCache Redis cache node between the poll interval.
Set Type Cmds	The total number of Set Type commands (write type commands) on the ElastiCache Redis cache node between the poll interval.
Key based commands	The total number of Key Based commands on the ElastiCache Redis cache node between the poll interval.
Non-Key based commands	The total number of Non Key Type commands on the ElastiCache Redis cache node between the poll interval.
DATA STRUCTURE COMMAND LATENCY
String Based commands Latency	The average String Based commands Latency on the ElastiCache Redis cache node between the poll interval (in microseconds).
Hash Based commands Latency	The average Hash Based commands Latency on the ElastiCache Redis cache node between the poll interval (in microseconds).
List Based commands Latency	The average List Based commands Latency on the ElastiCache Redis cache node between the poll interval (in microseconds).
Set Based commands Latency	The average Set Based commands Latency on the ElastiCache Redis cache node between the poll interval (in microseconds).
Sorted Set Based commands Latency	The average Sorted Set Based commands Latency on the ElastiCache Redis cache node between the poll interval (in microseconds).
Stream Based commands Latency	The average Stream Based commands Latency on the ElastiCache Redis cache node between the poll interval (in microseconds).
JSON Based commands Latency	The average JSON Based commands Latency on the ElastiCache Redis cache node between the poll interval (in microseconds).
HyperLogLog Based commands Latency	The average HyperLogLog Based commands Latency on the ElastiCache Redis cache node between the poll interval (in microseconds).
DATA STRUCTURE COMMAND USAGE
String based commands	The total number of String Based commands on the ElastiCache Redis cache node between the poll interval.
Hash based commands	The total number of Hash Based commands on the ElastiCache Redis cache node between the poll interval.
List based commands	The total number of List Based commands on the ElastiCache Redis cache node between the poll interval.
Set based commands	The total number of Set Based commands on the ElastiCache Redis cache node between the poll interval.
Sorted Set based commands	The total number of Sorted Set Based commands on the ElastiCache Redis cache node between the poll interval.
Stream based commands	The total number of Stream Based commands on the ElastiCache Redis cache node between the poll interval.
JSON based commands	The total number of JSON Based commands on the ElastiCache Redis cache node between the poll interval.
HyperLogLog based commands	The total number of HyperLogLog Based commands on the ElastiCache Redis cache node between the poll interval.
UTILITY COMMAND LATENCY
Cluster Based commands Latency	The average Cluster Based commands Latency on the ElastiCache Redis cache node between the poll interval (in microseconds).
Eval Based commands Latency	The average Eval Based commands Latency on the ElastiCache Redis cache node between the poll interval (in microseconds).
Geospatial Based commands Latency	The average Geospatial Based commands Latency on the ElastiCache Redis cache node between the poll interval (in microseconds).
Pub/Sub Based commands Latency	The average Pub/Sub Based commands Latency on the ElastiCache Redis cache node between the poll interval (in microseconds).
UTILITY COMMAND USAGE
Cluster based commands	The total number of Cluster Based commands on the ElastiCache Redis cache node between the poll interval.
Eval based commands	The total number of Eval Based commands on the ElastiCache Redis cache node between the poll interval.
Geospatial based commands	The total number of Geospatial Based commands on the ElastiCache Redis cache node between the poll interval.
Pub/Sub based commands	The total number of Pub/Sub Based commands on the ElastiCache Redis cache node between the poll interval.
REQUEST LATENCY
Successful Write Request Latency	The average Successful Write Request Latency on the ElastiCache Redis cache node between the poll interval (in microseconds).
Successful Read Request Latency	The average Successful Read Request Latency on the ElastiCache Redis cache node between the poll interval (in microseconds).
FAILED COMMANDS
Failed Commands	The total number of failed commands (Error Count) on the ElastiCache Redis cache node between the poll interval.
SEARCH STATISTICS
Search Indexes	The total number of Search Indexes created on the ElastiCache Redis cache node between the poll interval.
Search Indexed Documents	The total number of Search Indexed Documents (keys in all indexes) on the ElastiCache Redis cache node between the poll interval.
SEARCH MEMORY USAGE
Search Memory Used	The average Search Memory Used (data consumed in all search data structures) on the ElastiCache Redis cache node between the poll interval (in MB).

Note:Command Statistics tab metrics are disabled from data collection by default and mapped under performance polling as Command Statistics. To enable data collection, navigate to Settings → Performance Polling, select the Optimize Data Collection tab, choose Amazon ElastiCache Redis as the monitor type and Command Statistics as the metric name, then set the preferred time interval.

Configuration

Parameter	Description
CONFIGURATION
Cache Cluster ID	The unique identifier for the cache cluster node.
Engine Name	The name of the cache engine used on the node.
Engine Version	The version of the Redis engine running on the cache node.
Node Type	The instance type of the ElastiCache Redis cache node.
Creation Time	The date and time when the cache cluster was created.
Endpoint Address	The DNS hostname of the cache node endpoint.
Endpoint Port	The port number of the cache node endpoint.
Availability Zone	The AWS Availability Zone in which the cache node was created.
Replication Group ID	The identifier of the replication group to which this cache cluster belongs.
Preferred Maintenance Window	The weekly time range during which system maintenance can occur.
Parameter Group	The name of the cache parameter group associated with this cluster.
Subnet Group	The name of the cache subnet group associated with this cluster.
Snapshot Retention Limit	The number of days for which ElastiCache retains automatic snapshots before deleting them (in days).
Snapshot Window	The daily time range during which ElastiCache takes daily snapshots.
SECURITY CONFIGURATION
Security Group	The VPC security group associated with the cache cluster.
Transit Encryption	Whether data is encrypted in transit between the client and the cache node.
At-Rest Encryption	Whether data stored on disk is encrypted at rest.
Auto Minor Version Upgrade	Whether auto minor engine version upgrade is enabled for the cache cluster.

Amazon ElastiCache Redis Monitoring

Overview

Creating a new ElastiCache Redis monitor

Monitored parameters

Performance Overview

Network & Replication

Command Statistics

Configuration

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