Google Trends Graphs No Longer Embedded in Search Results?

For the past couple years Google has been embedding a Hot Trends graph in the regular search results for the top 100 fastest rising terms.

I referenced this in my post on tools for monitoring search and social trends because it was a useful way to check for trending terms beyond the top 20 shown on the Hot Searches page.

Then in December a colleague pointed out that the graphs were no longer being embedded in the search results. I’ve been spot checking since then and have yet to see them again in my own results.

Clicking on the Hot Searches links still brings up the graphs for the top 20 (see below) but the graphs no longer appear in the SERPs.

Did Google discontinue this feature?

I did some checking but can’t find any official confirmation or references in other places.