How to visualize crunchy-postgres-metrics into stackdriver by prometheus-to-sd ?

Appreciate your support as I need to scrape the metrics that exported by crunchy-postgres-exporter container and when I use prometheus-to-sd and specify my source, no metrics found in stack driver

note:
crunchy-postgres-exporter as a side car container with database container in the same pod,
I can do port-forward command for it's service via port 9187 and I can see the metrics by localhost:9187/metrics

what I need ?
I need to visualize the metrics that exported via localhost:9187 into stackdriver to see our database postgres metrics.