Merge pull request #54 from doflamingo721/grafana-fix

[release/1.12] Add dashboard revision check

Author: samkulkarni20

scripts/get_grafana_dashboards.sh

@@ -3,5 +3,7 @@
 # https://istio.io/latest/docs/ops/integrations/grafana/#option-1-quick-start
 for DASHBOARD in 7639 11829 7636 7630 7642 7645; do
   REVISION="$(curl -s https://grafana.com/api/dashboards/${DASHBOARD}/revisions -s | jq ".items[] | select(.description | endswith(\"${ISTIO_VERSION}\")) | .revision")"
-  curl -s https://grafana.com/api/dashboards/${DASHBOARD}/revisions/${REVISION}/download > /usr/local/app/dashboards/${DASHBOARD}.json
+if [[ $REVISION =~ ^[0-9]+$ ]]; then
+    curl -s https://grafana.com/api/dashboards/${DASHBOARD}/revisions/${REVISION}/download > /usr/local/app/dashboards/${DASHBOARD}.json
+fi
 done