in_plugin_update_message-{$file}

An array of plugin metadata.

• 'name'
  (string) The human-readable name of the plugin.
• 'plugin_uri'
  (string) Plugin URI.
• 'version'
  (string) Plugin version.
• 'description'
  (string) Plugin description.
• 'author'
  (string) Plugin author.
• 'author_uri'
  (string) Plugin author URI.
• 'text_domain'
  (string) Plugin text domain.
• 'domain_path'
  (string) Relative path to the plugin's .mo file(s).
• 'network'
  (bool) Whether the plugin can only be activated network wide.
• 'title'
  (string) The human-readable title of the plugin.
• 'author_name'
  (string) Plugin author's name.
• 'update'
  (bool) Whether there's an available update. Default null.

An array of metadata about the available plugin update.

• 'id'
  (int) Plugin ID.
• 'slug'
  (string) Plugin slug.
• 'new_version'
  (string) New plugin version.
• 'url'
  (string) Plugin URL.
• 'package'
  (string) Plugin update package URL.