It's not an exclamation mark, just an 'i' in a circle, presumably for 'information'.
That is new I have no idea why it shows that now.
Chrome did a self update in the last day or so, I've noticed this too.
Yes the "i" is for site info, click it and a drop down appears with options to look further still.
Forum gave grief today reporting 502's for various links/pages and still "Read replies" is giving me trouble.