---
title: 2020-42.x Release Notes
keywords: release notes
sidebar: doc_sidebar
permalink: 2020.42.x_release_notes.html
summary: New and updated features.
---

These release notes give an overview of the changes for Release 2020-42.x of the Wavefront service.

## Heading


## Miscellaneous Improvements

The derived metrics feature now supports both time series metrics and histograms. 

---
title: 2020-42.x Release Notes
keywords: release notes
sidebar: doc_sidebar
permalink: 2020.42.x_release_notes.html
summary: New and updated features.
---

These release notes give an overview of the changes for Release 2020-42.x of the Wavefront service.

## Tracing Features

### Introducing Apdex

The [apdex score](https://www.apdex.org/overview.html) helps you understand how the response time of a service compares to the predefined response time threshold (T). Using Wavefront, you can:

* Get an overview of how the apdex score is calculated and [Configure Apdex Settings](tracing_apdex.html).
* Use [`apdex()`](traces_function.html#apdex-function) to query the apdex score for your services, create charts, and create alerts.
* Use [`apdexLatency()`](traces_function.html#apdexlatency-functions) to query the satisfied threshold (T) and toleration threshold (4T) of a service.

### Configure Out-of-the-Box AWS and Database Services

Wavefront can identify Java AWS services and Java databases in the application map view. See [Configure Out-of-the-Box AWS and Database Services](tracing_external_services.html#configure-out-of-the-box-aws-and-database-services) for details on configuring your OpenTracing, OpenTelemetry, or Spring Cloud Sleuth application to identify out-of-the-box external services or applications that your service communicates.

![Shows the application map view that has two external AWS services and database service.](images/tracing_key_concepts_external_nodes.png)

### Configure Custom External Services

In addition to the out-of-the-box Java AWS and database service, Wavefront can identify your external applications or services. See [Configure Custom External Services](tracing_external_services.html#configure-custom-external-services).


## Miscellaneous Improvements

The derived metrics feature now supports both time series metrics and histograms. 

Update release notes with the tracing features for 65.x
Update release notes with the tracing features for 65.x
