jsonnet: by default select rules from all available namespaces

jsonnet/kube-prometheus/components/prometheus.libsonnet

@@ -277,14 +277,15 @@ function(params) {
       },
       externalLabels: p._config.externalLabels,
       serviceAccountName: 'prometheus-' + p._config.name,
-      serviceMonitorSelector: {},
       podMonitorSelector: {},
-      probeSelector: {},
-      serviceMonitorNamespaceSelector: {},
       podMonitorNamespaceSelector: {},
+      probeSelector: {},
       probeNamespaceSelector: {},
-      nodeSelector: { 'kubernetes.io/os': 'linux' },
+      ruleNamespaceSelector: {},
       ruleSelector: p._config.ruleSelector,
+      serviceMonitorSelector: {},
+      serviceMonitorNamespaceSelector: {},
+      nodeSelector: { 'kubernetes.io/os': 'linux' },
       resources: p._config.resources,
       alerting: {
         alertmanagers: [{