doc(gcplog): Advanced log export filter example (#3421)
doc(gcplog): Advanced log export filter example (#3421)

* doc(gcplog): Advanced log export filter example

* Update docs/sources/clients/promtail/gcplog-cloud.md

Co-authored-by: Owen Diehl <b7f53a77a4950cb4aa47d9da3f442809e803fde5@gmail.com>

Co-authored-by: Owen Diehl <b7f53a77a4950cb4aa47d9da3f442809e803fde5@gmail.com>
grafana/loki,grafana/loki,grafana/loki,grafana/loki,grafana/loki,grafana/loki