MvpImageRecommendationApiHandler is currently configured as the default add an image suggestion handler. It relies on https://image-suggestion-api.wmcloud.org, which is currently down, and that service has very old suggestions plus no one has the intention of maintaining it.

Production makes use of the image-suggestion service (https://wikitech.wikimedia.org/wiki/Image-suggestion). This service is currently available only from the production cluster (making it publicly available is tracked as T306349). This makes the production endpoint unusable for local developing (without setting up a tunel between developer's setup and WMF production).

In https://gerrit.wikimedia.org/r/c/mediawiki/extensions/GrowthExperiments/+/916880, we added ActionApiImageRecommendationApiHandler. This makes it possible for developers to use data loaded from a given remote wiki (such as, a WMF production one). This should be sufficient for local development purposes.

To unblock archival of https://image-suggestion-api.wmcloud.org (T344740 plus related Slack convo), we should switch to ActionApiImageRecommendationApiHandler as the default handler and remove support for the MVP one.