How many A2A agents exist per health state, protocol, registry, tag and publisher.

The counts behind the filters of /api/a2a/agents, over the whole index — no filter applies here. The index host checks collection checkpoints about every 9 minutes and recounts after a change or once a day. The last valid response survives restarts on disk; while it renews, a previously confirmed response is served for up to 6 hours. Free and outside the MAT read allowance. This host answers with a 308 to the index host https://api.agentalog.com — follow the redirect. Returns: { ok, facets, _links }