Answering my own question:
Until CONF-10572 is implemented by Atlassian, this is possible but time-consuming:
Then, for each macro M, search for "macroName:M" and count the results. This is also time-consuming for several reasons:
Here's a good place to start Confluence Admin | Administration | System Information e.g. at:
Look under the heading Plugins - it at least gives some of the information you want. Check the source code if you need to access more.
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