Merge pull request #3 from imusmanmalik/feat/multi-cluster-support

feat: Add support for multi-cluster

README.md

@@ -16,7 +16,7 @@ project documentation for examples on importing mixins.
 If you don't use the jsonnet based `kube-prometheus` project then you will need to
 generate the raw yaml files for inclusion in your Prometheus installation.
 
-Install the `jsonnet` dependencies (we use versions v0.16+):
+Install the `jsonnet` dependencies (tested against versions v0.20+):
 
 ```shell
 go get github.com/google/go-jsonnet/cmd/jsonnet
@@ -29,7 +29,15 @@ Generate yaml:
 make
 ```
 
-To use the dashboard, it can be imported or provisioned for Grafana by grabbig the [cert-manager.json](dashboards/cert-manager.json) file as is.
+To use the dashboard, it can be imported or provisioned for Grafana by grabbing the [cert-manager.json](dashboards/cert-manager.json) file as is.
+
+## Multi Cluster Support
+
+It is becoming a common use-case where we run multiple Kubernetes clusters, each one has its own certmanager and Prometheus instance. Those Prometheus remote-write metrics to a remote Long Term Storage, such as Thanos or Cortex, and a Grafana will now query metrics from the LTS tool instead of multiple Prometheus.
+
+Grafana dashboard have now selectors for the queries to the `_config` jsonnet object.
+
+There is a variable named `enableMultiCluster` to enable the multi cluster queries for the dashboard.
 
 ## Manifests
 

config.libsonnet

@@ -5,5 +5,33 @@
     certManagerJobLabel: 'cert-manager',
     certManagerRunbookURLPattern: 'https://gitlab.com/uneeq-oss/cert-manager-mixin/-/blob/master/RUNBOOK.md#%s',
     grafanaExternalUrl: 'https://grafana.example.com',
+
+    // Selectors are inserted between {} in Prometheus queries.
+
+    dashboards: {
+      enableMultiCluster: false,
+      clusterVariableSelector: '',
+
+      defaultSelector: if self.enableMultiCluster then 'cluster="$cluster"' else '',
+      containerSelector: if self.enableMultiCluster then 'container="cert-manager", cluster="$cluster"' else 'container="cert-manager"',
+      namespaceSelector: if self.enableMultiCluster then 'namespace="cert-manager", cluster="$cluster"' else 'namespace="cert-manager"',
+
+      certmanagerCertificateReadyStatusSelector: self.defaultSelector,
+      certmanagerCertificateExpirationTimestampSecondsSelector: self.defaultSelector,
+      certmanagerControllerSyncCallCountSelector: self.defaultSelector,
+      certmanagerHttpAcmeClientRequestCountSelector: self.defaultSelector,
+      certmanagerHttpAcmeClientRequestDurationSecondsSumSelector: self.defaultSelector,
+      certmanagerHttpAcmeClientRequestDurationSecondsCountSelector: self.defaultSelector,
+      containerCPUUsageSecondsTotalSelector: self.containerSelector,
+      kubePodContainerResourceLimitsCpuCoresSelector: self.containerSelector,
+      kubePodContainerResourceRequestsCpuCoresSelector: self.containerSelector,
+      containerCpuCfsThrottledPeriodsTotalSelector: self.containerSelector,
+      containerCpuCfsPeriodsTotalSelector: self.containerSelector,
+      containerMemoryUsageBytesSelector: self.containerSelector,
+      kubePodContainerResourceLimitsMemoryBytesSelector: self.containerSelector,
+      kubePodContainerResourceRequestsMemoryBytesSelector: self.containerSelector,
+      containerNetworkReceiveBytesTotalSelector: self.namespaceSelector,
+      containerNetworkTransmitBytesTotalSelector: self.namespaceSelector,
+    },
   },
 }