Tomcat cache metricsetedit

This functionality is in beta and is subject to change. The design and code is less mature than official GA features and is being provided as-is with no warranties. Beta features are not subject to the support SLA of official GA features.

Cache Metricset retrieves the JMX key Catalina:context=*,host=*,name=Cache,type=WebResourceRoot. It exposes the following metrics:

  • tomcat.cache.mbean: Mbean that this event is related to.
  • The number of requests for resources that were served from the cache.
  • The current estimate of the cache size in kB
  • tomcat.cache.size.max.kb: The maximum permitted size of the cache in kB
  • The number of requests for resources
  • The time-to-live for cache entries in milliseconds

This is a default metricset. If the host module is unconfigured, this metricset is enabled by default.


For a description of each field in the metricset, see the exported fields section.

Here is an example document generated by this metricset:

    "@timestamp": "2019-09-19T13:42:47.806Z",
    "@metadata": {
        "beat": "metricbeat",
        "type": "_doc",
        "version": "8.0.0"
    "event": {
        "dataset": "tomcat.cache",
        "module": "tomcat",
        "duration": 98441554
    "metricset": {
        "name": "cache",
        "period": 10000
    "service": {
        "address": "localhost:8080",
        "type": "tomcat"
    "tomcat": {
        "cache": {
            "mbean": "Catalina:context=/docs,host=localhost,name=Cache,type=WebResourceRoot",
            "hit": {
                "total": 4
            "size": {
                "total": {
                    "kb": 5
                "max": {
                    "kb": 10240
            "lookup": {
                "total": 13
            "ttl": {
                "ms": 5000
    "ecs": {
        "version": "1.1.0"
    "host": {
        "id": "54f70115bae545cbac2b150f254472a0",
        "containerized": false,
        "hostname": "mcastro",
        "architecture": "x86_64",
        "name": "mcastro",
        "os": {
            "family": "",
            "name": "Antergos Linux",
            "kernel": "5.0.13-arch1-1-ARCH",
            "platform": "antergos",
            "version": ""
    "agent": {
        "version": "8.0.0",
        "type": "metricbeat",
        "ephemeral_id": "ccb9ebe2-bd8b-4d90-a362-37132e09370b",
        "hostname": "mcastro",
        "id": "7e36a073-1a32-4a94-b65b-4c7f971fb228"