AdWords API users in the United States, United Kingdom, Germany, France and Spain who have been using call metrics with call extensions may be affected by a change we are rolling out starting on March 3rd, 2014.
Previously, the default was to enable call metrics when the TRACKED placeholder was not included as an AttributeFieldMapping in the CALL Feed. We will be updating how this works by enabling this feature only when specifically requested. You can still enable call metrics, if available in your country, when setting up the call extension or modifying an existing extension with this placeholder.
This change may affect your current call extensions. Any call extensions that have not explicitly enabled call metrics will stop collecting metrics starting on March 3rd. If you rely on call metrics data, you should make sure that all of your call extensions have explicitly enabled call metrics. If you were already setting this flag when creating call extensions in any version of the API, then no further action is required.
If you have any questions about this upcoming change or anything else related to the AdWords API, please contact us on the forum or via our Google+ page.