Redis (2.0)

Collect important additional data for your Redis instances.

Extension

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Product information
Release notes

Overview

Redis is an open-source, in-memory, key-value database (or "data structure server") with optional durability. Redis is commonly used as a database, cache, queue, and message broker (publish and subscribe). Out of the box, Dynatrace monitors the standard Redis process level metrics. Using this extension you can collect additional Redis metrics including response time, memory fragmentation, cache hit ratio, cache usage, number of connections, hits, misses, and more.

Use cases

Monitor for critical issues such as unsynchronized replicas or synchronization tasks taking longer than expected
Identify memory related issues such as excessive memory fragmentation or keys being evicted due to memory limits being reached
Detect if clients are being rejected due to the maxclients limit
Identify if there is an increasing number of queries exceeding their specified execution times (reported in the slow log)

Compatibility information

Requirements and limitations

Redis Server 2.8 or higher
Linux OS
Redis must listen on localhost. Binding between localhost and the Redis port is required.

Docker support

Redis docker image version 5.0.0+

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Extension content

Content typeNumber of items included

alerts

2

metric metadata

23

screen injections

16

screen chart groups

16

document dashboard

1

dashboards

1

Feature sets

Below is a complete list of the feature sets provided in this version. To ensure a good fit for your needs, individual feature sets can be activated and deactivated by your administrator during configuration.

Feature setsNumber of metrics included

Metric name	Metric key	Description	Unit
Keys	redis.keys	The number of keys in the selected database.	Count
Expires	redis.expires	The number of keys that have the TTL parameter.	Count
Average time-to-live	redis.avg_ttl	The estimated average TTL of keys on the server.	MilliSecond

Metric name	Metric key	Description	Unit
Role	redis.role	The role of the Redis instance (e.g. master, slave, or sentinel)	State
Responsiveness	redis.responsiveness	The time elapsed while the Redis server responds to INFO requests. Redis typically responds within milliseconds.	MilliSecond

Metric name	Metric key	Description	Unit
Slow queries	redis.slowlog_len.count	The number of queries added in the Redis slow log.	Count

Metric name	Metric key	Description	Unit
Keyspace hits	redis.keyspace_hits.count	Number of successful key lookups in the main dictionary.	Count
Keyspace misses	redis.keyspace_misses.count	Number of failed key lookups.	Count
Evicted keys	redis.evicted_keys.count	Number of keys removed from cache to free up memory for new items	Count
Expired keys	redis.expired_keys.count	Number of key expiration events.	Count
Commands processed	redis.total_commands_processed.count	Number of commands processed by Redis.	Count
Cache hit ratio	redis.hit_ratio	The percentage of key lookups in the main dictionary that were successful.	Percent

Metric name	Metric key	Description	Unit
Connected clients	redis.connected_clients	Number of client connections (excluding connections from replicas).	Count
Blocked clients	redis.blocked_clients	The number of blocked clients	Count
Connections received	redis.total_connections_received.count	Number of connections accepted by the server.	Count
Rejected connections	redis.rejected_connections.count	The number of connections rejected because of the maxclients limit.	Count

Metric name	Metric key	Description	Unit
Used memory	redis.used_memory	The amount of memory in-use	Byte
Max memory	redis.maxmemory	The maximum memory allowed in Redis cache.	Byte
Memory fragmentation ratio	redis.mem_fragmentation_ratio	The ratio of memory used by the operating system compared to the amount of memory allocated by Redis.	Percent
Memory usage	redis.memory_usage	The percentage of utilized Redis memory. This metric is visible only when the Redis maxmemory parameter is configured.	Percent

Metric name	Metric key	Description	Unit
Connected replicas	redis.connected_replicas	Number of connected replicas. This metric is visible for the master and those replicas that are connected to other replicas.	Count
Last master interaction time	redis.master_last_io_seconds_ago	Time since interaction with the master	Second

Full version history

To have more information on how to install the downloaded package, please follow the instructions on this page.

ReleaseDate

Full version history

Minimum OneAgent version is 1.314.0

Features

Support for client-side certificate based authentication

Full version history

Changes

Improved error handling (Dynatrace Error Codes) and Endpoint Statuses.

Full version history

Minimum Dynatrace version now 1.314!

Changes

Included platform dashboard
Metrics displayed for process group instance in Infrastructure & Operations App

Full version history

Features

TLS/SSL support
Parsing of redis configuration file to automatically retrieve and use password for default user

Full version history

Fixes bug that prevented redis.hit_ratio from being reported.

Full version history

Fix bug in snapshot processing that could prevent some intervals from collecting data
Correct data type of top-level password to be an encrypted secret

Full version history

Correct logic in parsing of snapshot file to avoid breaking in some scenarios

Full version history

detect and handle sentinel processes more cleanly
attempt to connect without a password if scenario detected where a password was provided but is not needed

Full version history

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