wp_ajax_w3tc_imageservice_postmeta

See hook in action

See this hook used in plugins:

Select Pluginw3-total-cache.2.2.1w3-total-cache.2.2.3w3-total-cache.2.2.4w3-total-cache.2.2.6w3-total-cache.2.2.7w3-total-cache.2.2.9w3-total-cache.2.2.12w3-total-cache.2.3.0w3-total-cache.2.3.1w3-total-cache.2.3.2w3-total-cache.2.3.3w3-total-cache.2.4.1w3-total-cache.2.5.0w3-total-cache.2.6.0w3-total-cache.2.6.1w3-total-cache.2.7.0