Does Heimerdinger see Renata's (Chem-Baroness's) Exhaust ability?

Ruling: No, Heimerdinger does not see Renata's Exhaust ability.

Nuances:

• Renata (Chem-Baroness) has a triggered ability that exhausts itself, not an activated ability
• Heimerdinger only triggers on activated abilities that exhaust as a cost (signified by the exhaust symbol as part of the cost)
• The distinction is between exhausting as a cost versus exhausting as part of a triggered effect