add metrics endpoint to broker, update alerts

broker/src/asapo_broker/go.mod

broker/src/asapo_broker/go.sum

broker/src/asapo_broker/server/server_nottested.go

deploy/asapo_services/scripts/alert.yml.tpl

deploy/asapo_services/scripts/alertmanager.yml.tpl

deploy/asapo_services/scripts/asapo-monitoring.nmd.tpl

deploy/asapo_services/scripts/asapo-receivers.nmd.tpl

deploy/asapo_services/scripts/asapo.auto.tfvars.in

deploy/asapo_services/scripts/prometheus.yml.tpl

deploy/asapo_services/scripts/templates.tf

deploy/asapo_services/scripts/vars.tf