Merge branch 'metrics' into 'master'

README.md

cmd/cgat/main.go

go.mod

go.sum

lib/gat/admin/admin.go

lib/gat/database/database.go

lib/gat/gatling/client/client.go

lib/gat/gatling/gatling.go

lib/gat/interfaces.go

lib/gat/pool/transaction/pool.go

lib/gat/pool/transaction/worker.go

lib/gat/stats.go

lib/metrics/buckets.go

lib/metrics/gat.go

lib/metrics/metrics.go

lib/metrics/pool.go

test/docker-compose.yml