ops/monitoring: pull in grafonnet-7.0

Change-Id: Ie036ef767419418876a18255a5ad378f5cfa1535
diff --git a/ops/monitoring/lib/grafonnet/target/prometheus.libsonnet b/ops/monitoring/lib/grafonnet/target/prometheus.libsonnet
new file mode 100644
index 0000000..5bfe65d
--- /dev/null
+++ b/ops/monitoring/lib/grafonnet/target/prometheus.libsonnet
@@ -0,0 +1,19 @@
+// This file was generated by https://github.com/grafana/dashboard-spec
+
+{
+  new(
+    datasource='default',
+    expr=null,
+    format='time_series',
+    interval=null,
+    intervalFactor=null,
+    legendFormat=null,
+  ):: {
+    [if datasource != null then 'datasource']: datasource,
+    [if expr != null then 'expr']: expr,
+    [if format != null then 'format']: format,
+    [if interval != null then 'interval']: interval,
+    [if intervalFactor != null then 'intervalFactor']: intervalFactor,
+    [if legendFormat != null then 'legendFormat']: legendFormat,
+  },
+}