You can find Alerts and Metrics in the drop down menu in the top left:
You can set up alerts by clicking the envelope icon in the sidebar of the search results page; enter your email address, and click "Create alert". Google will periodically email you newly published papers that match your search criteria. You do not need a Google account to set up an alert but you will need one to cancel or manage your alerts.
Google Scholar Metrics indicate the visibility and influence of recent articles in scholarly publications indexes in Google Scholar. For example you can browse the top 100 publications ordered by their five-year h-index and h-median metrics.
Google Scholar Citations provide a simple way for you to keep track of citations to your articles. You can also make your profile public, so that it may appear in Google Scholar results when people search for your name. Your citation metrics are computed and updated automatically as Google Scholar finds new citations to your work on the web.