I think currently the only way to figure out the details of those
mySomething is to examine the process builder metadata (metadata file can be retrieved by using Salesforce CLI, ant Migration Tool, etc).
After retrieving the metadata from Salesforce, open up the
*.flow with text editor, and you can see which
mySomething corresponds to which decision node, action, rule, etc.
For example, I have this process builder:
The flow metadata file content is like this:
<?xml version="1.0" encoding="UTF-8"?>
<label>Account Rating Hot?</label>
Salesforce automatically names my decision node as
myRule_1, and a bit further down, the label tag will tell me that the corresponding decision node is the one I labelled as
Account Rating Hot?.
Right above the decision node label, I can see the connector tag has
myRule_1_A1 target reference, and below is the related xml snippet:
From the label, I can easily tell that
myRule_1_A1 is the chatter post action.
So basically in short: pull the metadata, search for the variable name, and check the corresponding label.