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A "sub-registry" can be any implementation of Micrometer's MeterRegistry class. See the Micrometer documentation for descriptions of the available implementations, and instructions for how to configure them to send information to your monitoring system.

When you add a registry to Geode as a sub-registry to Geode, Geode adds all of its current meters to your sub-registry. It also adds any subsequently created meters and keeps your sub-registry informed of all future updates to the values of the meters.

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How to Add a Meter Registry for Publishing

Geode offers two mechanisms to add a sub-meter registry for publishing. Which mechanism you choose depends on how you create the cache.

• If you create the cache using a CacheFactory, you can call the factory's addSubregistry() method one or more times to add sub-registries to the cache it creates. See Adding a Sub-How to Add a Meter Registry when Creating a Cache, below.
• If the cache is created for you as part of a server or locator, you can implement a custom MetricsPublishingService service that initializes your sub-registry and adds it to the cache. See Adding a Sub-Registry to How to Add a Meter Registry when Starting a Server or Locator, below.

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How to Add a Meter Registry when Creating a Cache

CacheFactory provides a method which adds the given meter registry to the cache's composite registry for publishing cache metrics to external monitoring systems:

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Note: The above APIs are considered experimental. Micrometer metrics is a new addition to Geode 1.9 and the API may change.

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How to Add a Meter Registry when Starting a Server or Locator

The new interface org.apache.geode.metrics.MetricsPublishingService provides an additional way to publish metrics generated by Micrometer meters in the cache meter registry. Geode discovers implementations of MetricsPublishingService during cache creation, using the standard Java ServiceLoader mechanism.

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