diff --git a/prometheus-ksonnet/grafana/dashboards.libsonnet b/prometheus-ksonnet/grafana/dashboards.libsonnet
index b7af2d997..41d763b42 100644
--- a/prometheus-ksonnet/grafana/dashboards.libsonnet
+++ b/prometheus-ksonnet/grafana/dashboards.libsonnet
@@ -7,11 +7,38 @@
     dashboard_config_maps: 8,
   },
 
-  // Extension point for you to add your own dashboards.
-  dashboards+:: {},
-  grafana_dashboards+:: {},
-  grafanaDashboards+:: $.dashboards + $.grafana_dashboards,
-  dashboardsByFolder+:: {},
+  // New API: Mixins go in the mixins map.
+  mixins+:: {},
+
+  // emptyMixin allows us to reliably do `mixin.grafanaDashboards` without
+  // having to check the field exists first. Some mixins don't declare all
+  // the fields, and thats fine.
+  local emptyMixin = {
+    grafanaDashboards+: {},
+  },
+
+  // Legacy extension points for you to add your own dashboards.
+  grafanaDashboards+:: std.foldr(
+    function(mixinName, acc)
+      local mixin = $.mixins[mixinName] + emptyMixin;
+      if !std.objectHas(mixin, 'grafanaDashboardFolder')
+      then acc + mixin.grafanaDashboards
+      else acc,
+    std.objectFields($.mixins),
+    {}
+  ),
+
+  dashboardsByFolder+:: std.foldr(
+    function(mixinName, acc)
+      local mixin = $.mixins[mixinName] + emptyMixin;
+      if std.objectHas(mixin, 'grafanaDashboardFolder')
+      then acc {
+        [mixin.grafanaDashboardFolder]: mixin.grafanaDashboards,
+      }
+      else acc,
+    std.objectFields($.mixins),
+    {}
+  ),
 
   local materialise_config_map(config_map_name, dashboards) =
     configMap.new(config_map_name) +
diff --git a/prometheus-ksonnet/lib/config.libsonnet b/prometheus-ksonnet/lib/config.libsonnet
index 243d9bec5..69f5411cb 100644
--- a/prometheus-ksonnet/lib/config.libsonnet
+++ b/prometheus-ksonnet/lib/config.libsonnet
@@ -81,25 +81,6 @@
     // Node exporter options.
     node_exporter_mount_root: true,
 
-    // Kubernetes mixin overrides.
-    cadvisorSelector: 'job="kube-system/cadvisor"',
-    kubeletSelector: 'job="kube-system/kubelet"',
-    kubeStateMetricsSelector: 'job="%s/kube-state-metrics"' % $._config.namespace,
-    nodeExporterSelector: 'job="%s/node-exporter"' % $._config.namespace,  // Also used by node-mixin.
-    notKubeDnsSelector: 'job!="kube-system/kube-dns"',
-    kubeSchedulerSelector: 'job="kube-system/kube-scheduler"',
-    kubeControllerManagerSelector: 'job="kube-system/kube-controller-manager"',
-    kubeApiserverSelector: 'job="kube-system/kube-apiserver"',
-    podLabel: 'instance',
-    grafanaPrefix: '/grafana',  // Also used by node-mixin.
-
-    // Prometheus mixin overrides.
-    prometheusSelector: 'job="default/prometheus"',
-    alertmanagerSelector: 'job="default/alertmanager"',
-
-    // Node mixin overrides.
-    nodeCriticalSeverity: 'warning',  // Do not page if nodes run out of disk space.
-
     // oauth2-proxy
     oauth_enabled: false,
   },
diff --git a/prometheus-ksonnet/lib/prometheus-config.libsonnet b/prometheus-ksonnet/lib/prometheus-config.libsonnet
index 8522cfee3..e993b2d60 100644
--- a/prometheus-ksonnet/lib/prometheus-config.libsonnet
+++ b/prometheus-ksonnet/lib/prometheus-config.libsonnet
@@ -363,75 +363,92 @@
     ],
   },
 
-  // Extension points for adding alerts, recording rules and prometheus config.
-  prometheus_alerts:: {
-    groups+: [
-      {
-        name: 'prometheus-extra',
-        rules: [
-          {
-            alert: 'PromScrapeFailed',
-            expr: |||
-              up != 1
-            |||,
-            'for': '15m',
-            labels: {
-              severity: 'warning',
-            },
-            annotations: {
-              message: 'Prometheus failed to scrape a target {{ $labels.job }} / {{ $labels.instance }}',
-            },
-          },
-          {
-            alert: 'PromScrapeFlapping',
-            expr: |||
-              avg_over_time(up[5m]) < 1
-            |||,
-            'for': '15m',
-            labels: {
-              severity: 'warning',
+  // Legacy Extension points for adding alerts, recording rules and prometheus config.
+  local emptyMixin = {
+    prometheusAlerts+:: {},
+    prometheusRules+:: {},
+  },
+
+  prometheusAlerts::
+    {
+      groups+: [
+        {
+          name: 'prometheus-extra',
+          rules: [
+            {
+              alert: 'PromScrapeFailed',
+              expr: |||
+                up != 1
+              |||,
+              'for': '15m',
+              labels: {
+                severity: 'warning',
+              },
+              annotations: {
+                message: 'Prometheus failed to scrape a target {{ $labels.job }} / {{ $labels.instance }}',
+              },
             },
-            annotations: {
-              message: 'Prometheus target flapping {{ $labels.job }} / {{ $labels.instance }}',
+            {
+              alert: 'PromScrapeFlapping',
+              expr: |||
+                avg_over_time(up[5m]) < 1
+              |||,
+              'for': '15m',
+              labels: {
+                severity: 'warning',
+              },
+              annotations: {
+                message: 'Prometheus target flapping {{ $labels.job }} / {{ $labels.instance }}',
+              },
             },
-          },
-          {
-            alert: 'PromScrapeTooLong',
-            expr: |||
-              scrape_duration_seconds > 60
-            |||,
-            'for': '15m',
-            labels: {
-              severity: 'warning',
+            {
+              alert: 'PromScrapeTooLong',
+              expr: |||
+                scrape_duration_seconds > 60
+              |||,
+              'for': '15m',
+              labels: {
+                severity: 'warning',
+              },
+              annotations: {
+                message: '{{ $labels.job }} / {{ $labels.instance }} is taking too long to scrape ({{ printf "%.1f" $value }}s)',
+              },
             },
-            annotations: {
-              message: '{{ $labels.job }} / {{ $labels.instance }} is taking too long to scrape ({{ printf "%.1f" $value }}s)',
+          ],
+        },
+      ],
+    } +
+    std.foldr(
+      function(mixinName, acc)
+        local mixin = $.mixins[mixinName] + emptyMixin;
+        acc + mixin.prometheusAlerts,
+      std.objectFields($.mixins),
+      {}
+    ),
+
+  prometheusRules::
+    {
+      groups+: [
+        {
+          // Add mapping from namespace, pod -> node with node name as pod, as
+          // we use the node name as the node-exporter instance label.
+          name: 'instance_override',
+          rules: [
+            {
+              record: 'node_namespace_pod:kube_pod_info:',
+              expr: |||
+                max by(node, namespace, instance) (label_replace(kube_pod_info{job="default/kube-state-metrics"}, "instance", "$1", "node", "(.*)"))
+              |||,
             },
-          },
-        ],
-      },
-    ],
-  },
-
-  prometheus_rules:: {
-    groups+: [
-      {
-        // Add mapping from namespace, pod -> node with node name as pod, as
-        // we use the node name as the node-exporter instance label.
-        name: 'instance_override',
-        rules: [
-          {
-            record: 'node_namespace_pod:kube_pod_info:',
-            expr: |||
-              max by(node, namespace, instance) (label_replace(kube_pod_info{job="default/kube-state-metrics"}, "instance", "$1", "node", "(.*)"))
-            |||,
-          },
-        ],
-      },
-    ],
-  },
-
-  // We changes to using camelCase, but here we try and make it backwards compatible.
-  prometheusAlerts+:: $.prometheus_alerts,
-  prometheusRules+:: $.prometheus_rules,
+          ],
+        },
+      ],
+    } +
+    std.foldr(
+      function(mixinName, acc)
+        local mixin = $.mixins[mixinName] + emptyMixin;
+        acc + mixin.prometheusRules,
+      std.objectFields($.mixins),
+      {},
+    ),
 }
diff --git a/prometheus-ksonnet/mixins.libsonnet b/prometheus-ksonnet/mixins.libsonnet
new file mode 100644
index 000000000..fdcaedc5f
--- /dev/null
+++ b/prometheus-ksonnet/mixins.libsonnet
@@ -0,0 +1,44 @@
+{
+  // Add you mixins here.
+  mixins+:: {
+    kubernetes:
+      (import 'kubernetes-mixin/mixin.libsonnet') {
+        _config+:: {
+          cadvisorSelector: 'job="kube-system/cadvisor"',
+          kubeletSelector: 'job="kube-system/kubelet"',
+          kubeStateMetricsSelector: 'job="%s/kube-state-metrics"' % $._config.namespace,
+          nodeExporterSelector: 'job="%s/node-exporter"' % $._config.namespace,  // Also used by node-mixin.
+          notKubeDnsSelector: 'job!="kube-system/kube-dns"',
+          kubeSchedulerSelector: 'job="kube-system/kube-scheduler"',
+          kubeControllerManagerSelector: 'job="kube-system/kube-controller-manager"',
+          kubeApiserverSelector: 'job="kube-system/kube-apiserver"',
+          podLabel: 'instance',
+        },
+      },
+
+    prometheus:
+      (import 'prometheus-mixin/mixin.libsonnet') {
+        _config+:: {
+          prometheusSelector: 'job="default/prometheus"',
+        },
+      },
+
+    alertmanager:
+      (import 'alertmanager-mixin/mixin.libsonnet') {
+        _config+:: {
+          alertmanagerSelector: 'job="default/alertmanager"',
+        },
+      },
+
+    node_exporter:
+      (import 'node-mixin/mixin.libsonnet') {
+        _config+:: {
+          nodeExporterSelector: 'job="%s/node-exporter"' % $._config.namespace,  // Also used by node-mixin.
+
+          // Do not page if nodes run out of disk space.
+          nodeCriticalSeverity: 'warning',
+          grafanaPrefix: '/grafana',
+        },
+      },
+  },
+}
diff --git a/prometheus-ksonnet/prometheus-ksonnet.libsonnet b/prometheus-ksonnet/prometheus-ksonnet.libsonnet
index a9e71b0bb..a6a648175 100644
--- a/prometheus-ksonnet/prometheus-ksonnet.libsonnet
+++ b/prometheus-ksonnet/prometheus-ksonnet.libsonnet
@@ -8,8 +8,5 @@
 (import 'lib/prometheus.libsonnet') +
 (import 'lib/prometheus-config.libsonnet') +
 (import 'lib/prometheus-configmap.libsonnet') +
-(import 'kubernetes-mixin/mixin.libsonnet') +
-(import 'prometheus-mixin/mixin.libsonnet') +
-(import 'alertmanager-mixin/mixin.libsonnet') +
-(import 'node-mixin/mixin.libsonnet') +
-(import 'lib/config.libsonnet')
+(import 'lib/config.libsonnet') +
+(import 'mixins.libsonnet')