Memcached extension
- Latest Dynatrace
- Extension
- Published Oct 27, 2025
Get insight on your distributed caching system.
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Overview
Monitor Memcached servers to detect database issues and optimize cache performance.
Memchaced is a distributed caching system used to speed up dynamic database-driven websites. Dynatrace Memcached server monitoring provides insights into your distributed memory-object caching system so that you can pinpoint server performance issues and identify potential bottlenecks.
Compatibility information
- Dynatrace OneAgent version 1.265+
- Memcached Server 1.4.24+
- Dynatrace supports TCP UDP and socket connections to Memcached servers. Admin permissions are required for socket connection types 666 or higher.
Activation and setup
- Go to Hub.
- Find Memcached and select Add to environment.
- Create a configuration. No parameters are needed, just activate it and you're ready to go.
We recommend enabling the extension only on the hosts where memcached is actually running.
Feature sets
When activating your extension using monitoring configuration, you can limit monitoring to one of the feature sets. To work properly, the extension has to collect at least one metric after the activation.
In highly segmented networks, feature sets can reflect the segments of your environment. Then, when you create a monitoring configuration, you can select a feature set and a corresponding ActiveGate group that can connect to this particular segment.
All metrics that aren't categorized into any feature set are considered to be the default and are always reported.
A metric inherits the feature set of a subgroup, which in turn inherits the feature set of a group. Also, the feature set defined on the metric level overrides the feature set defined on the subgroup level, which in turn overrides the feature set defined on the group level.
Memory usage
| Metric name | Metric key | Description |
|---|---|---|
| Memory max bytes | memcached.limit_maxbytes | Maximum memory allocated for Memcached |
| Memory bytes | memcached.bytes | Current memory usage in Memcached |
| Memory evictions | memcached.evictions.count | Number of items evicted from cache in Memcached |
| Malloc fails | memcached.malloc_fails.count | Number of memory allocation failures in Memcached |
| Memory reclaims | memcached.reclaimed.count | Number of memory reclaims in Memcached |
Throughput
| Metric name | Metric key | Description |
|---|---|---|
| Read throughput | memcached.bytes_read.count | Number of bytes read from Memcached |
| Write throughput | memcached.bytes_written.count | Number of bytes written to Memcached |
Log
| Metric name | Metric key | Description |
|---|---|---|
| Log worker dropped | memcached.log_worker_dropped.count | Number of log entries dropped by the log worker in Memcached |
| Log worker written | memcached.log_worker_written.count | Number of log entries written by the log worker in Memcached |
| Log watcher skipped | memcached.log_watcher_skipped.count | Number of log entries skipped by the log watcher in Memcached |
| Log watcher sent | memcached.log_watcher_sent.count | Number of log entries sent by the log watcher in Memcached |
Connections
| Metric name | Metric key | Description |
|---|---|---|
| Connections | memcached.curr_connections | Current number of client connections to Memcached |
| Rejected connections | memcached.rejected_connections.count | Number of client connections rejected by Memcached |
Uptime
| Metric name | Metric key | Description |
|---|---|---|
| Uptime | memcached.uptime | Uptime of the Memcached instance, in seconds |
Threads
| Metric name | Metric key | Description |
|---|---|---|
| Threads | memcached.threads | Number of threads in Memcached |
Usage
| Metric name | Metric key | Description |
|---|---|---|
| Get commands | memcached.cmd_get.count | Number of get commands executed in Memcached |
| Set commands | memcached.cmd_set.count | Number of set commands executed in Memcached |
| Get hits | memcached.get_hits.count | Number of successful get commands in Memcached |
| Get misses | memcached.get_misses.count | Number of unsuccessful get commands in Memcached |
