I wouldn't worry too much, they were expecting them (albeit this was a biggie). The L2 point it's at means there shouldn't be too much that collects around there, gravity wise, but it will happen again.
"wavefront sensing recorded six localized surface deformations on the primary mirror that are attributed to impact by micrometeoroids. These occurred at a rate (roughly one per month) consistent with pre-launch expectations […] Of the six micrometeoroid strikes detected thus far through wavefront sensing, five had negligible effects".
So the overall number of impacts is consistent with the modeled rate, but the size of the C3 event was outside the modeled rate.
