Seeded mock history recorded docker hosts with cpu, memory and disk only,
while the synthetic generator used past the seed window emits the full guest
metric set. The result was an inversion across chart ranges: a docker host had
no diskread, diskwrite, netin or netout history at 5m through 24h and full
history at 7d and 30d. Real docker hosts report both through the agent, so the
seed now covers the same series the generator does and every range agrees.
The guardrail test asserts seeded coverage matches the synthetic metric set
rather than a hand-listed set, so a future series added to one path cannot
quietly skip the other.
rcourtman
dd49fbd93e