loki.source.docker resumes from a one-second position and Docker's since
is inclusive, so each restart re-reads a container's last logged second.
For idle containers those lines are older than 7 days and Grafana Cloud
Loki rejects the batch with 400 timestamp too old. Drop them before
loki.write; Loki would not have stored them anyway.
alloy: move to latest tags (no moving major tag upstream), trim comments to what each line does.
diun: order .env.example like compose.yml.
couchbase: add .env.example, drop the version key, explain the published ports.