add walnut creek and gary dashboards

README.md

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+# grafana-dashboards
+Grafana dashboard JSON files for Galion Systems client sites.

dashboards/gary_in/compressor_status.json

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+{"title":"Gary IN Facility - Compressor Status","uid":"gary-comp","version":1,
+ "panels":[
+   {"type":"timeseries","title":"Compressor Outlet Pressure","id":1,
+    "targets":[{"expr":"modbus_holding{site=\"gary_in\",tag=\"comp_pressure_psi\"}"}]}
+ ],"time":{"from":"now-4h","to":"now"},"refresh":"1m"}

dashboards/walnut_creek/process_overview.json

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+{"title":"Walnut Creek WTP - Process Overview","uid":"wc-proc-overview","version":3,
+ "panels":[
+   {"type":"gauge","title":"Influent Flow (GPM)","id":1,
+    "targets":[{"expr":"modbus_holding{site=\"walnut_creek\",tag=\"flow_rate_gpm\"}"}]},
+   {"type":"stat","title":"Tank Level (ft)","id":2,
+    "targets":[{"expr":"modbus_holding{site=\"walnut_creek\",tag=\"tank_level_ft\"}"}]},
+   {"type":"stat","title":"Pump 1 Status","id":3,
+    "targets":[{"expr":"modbus_holding{site=\"walnut_creek\",tag=\"pump1_status\"}"}]}
+ ],"time":{"from":"now-1h","to":"now"},"refresh":"30s"}

provisioning/datasources/prometheus.yaml

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+apiVersion: 1
+datasources:
+  - name: Prometheus
+    type: prometheus
+    url: http://localhost:9090
+    isDefault: true