The agent collection is DRF-paginated, so `count` already carries the
filtered total. endpoint_count asks for limit=1 and reads it, instead of
pulling up to 10000 agent records back through the playbook the way
endpoint_search does — and endpoint_search only filters on hostname.
Filters cover the documented agent query parameters (hostname, network,
os, version, status, isolation_state, tenant), add lastseen/firstseen
bounds over the DRF range lookups, and keep a raw `filters` escape hatch
for anything else the instance accepts.
The API silently drops a query parameter it does not recognise as a
filter, which turns a typo into a plausible-looking fleet-wide total, so
the fleet `total` is returned next to `count` to make that case visible.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
