feat: add recording rules for resources

mixin.libsonnet

@@ -1,2 +1,3 @@
 (import 'dashboards/dashboards.libsonnet') +
+(import 'rules/rules.libsonnet') +
 (import 'config.libsonnet')

rules/namespace.libsonnet

@@ -0,0 +1,110 @@
+{
+  _config+:: {
+    clusterLabel: 'k8s_cluster_name',
+  },
+
+  prometheusRules+:: {
+    groups+: [
+      {
+        name: 'otel.k8s.rules.namespace_cpu_requests',
+        rules: [
+          {
+            // CPU requests for active pods (Pending or Running) by pod, summed from containers
+            record: 'namespace_pod:k8s_container_cpu_request:sum_active',
+            expr: |||
+              sum by (%(clusterLabel)s, k8s_namespace_name, k8s_pod_name) (
+                max by (%(clusterLabel)s, k8s_namespace_name, k8s_pod_name, k8s_container_name) (
+                  k8s_container_cpu_request
+                )
+              ) * on (%(clusterLabel)s, k8s_namespace_name, k8s_pod_name) group_left()
+              clamp_max(
+                max by (%(clusterLabel)s, k8s_namespace_name, k8s_pod_name) (
+                  (k8s_pod_phase == 1) or (k8s_pod_phase == 2)
+                ), 1
+              )
+            ||| % $._config,
+          },
+        ],
+      },
+      {
+        name: 'otel.k8s.rules.namespace_cpu_usage_vs_requests',
+        rules: [
+          {
+            // CPU usage rate vs requests ratio for active pods
+            record: 'namespace_pod:k8s_pod_cpu_usage_vs_request:ratio_rate5m',
+            expr: |||
+              sum by (%(clusterLabel)s, k8s_namespace_name, k8s_pod_name) (
+                max by (%(clusterLabel)s, k8s_namespace_name, k8s_pod_name) (
+                  rate(k8s_pod_cpu_time_seconds_total[5m])
+                )
+                /
+                (
+                  sum by (%(clusterLabel)s, k8s_namespace_name, k8s_pod_name) (
+                    max by (%(clusterLabel)s, k8s_namespace_name, k8s_pod_name, k8s_container_name) (
+                      k8s_container_cpu_request
+                    )
+                  ) * on (%(clusterLabel)s, k8s_namespace_name, k8s_pod_name) group_left()
+                  clamp_max(
+                    max by (%(clusterLabel)s, k8s_namespace_name, k8s_pod_name) (
+                      (k8s_pod_phase == 1) or (k8s_pod_phase == 2)
+                    ), 1
+                  )
+                )
+              )
+            ||| % $._config,
+          },
+        ],
+      },
+      {
+        name: 'otel.k8s.rules.namespace_cpu_limits',
+        rules: [
+          {
+            // CPU limits for active pods (Pending or Running) by pod, summed from containers
+            record: 'namespace_pod:k8s_container_cpu_limit:sum_active',
+            expr: |||
+              sum by (%(clusterLabel)s, k8s_namespace_name, k8s_pod_name) (
+                max by (%(clusterLabel)s, k8s_namespace_name, k8s_pod_name, k8s_container_name) (
+                  k8s_container_cpu_limit
+                )
+              ) * on (%(clusterLabel)s, k8s_namespace_name, k8s_pod_name) group_left()
+              clamp_max(
+                max by (%(clusterLabel)s, k8s_namespace_name, k8s_pod_name) (
+                  (k8s_pod_phase == 1) or (k8s_pod_phase == 2)
+                ), 1
+              )
+            ||| % $._config,
+          },
+        ],
+      },
+      {
+        name: 'otel.k8s.rules.namespace_cpu_usage_vs_limits',
+        rules: [
+          {
+            // CPU usage rate vs limits ratio for active pods
+            record: 'namespace_pod:k8s_pod_cpu_usage_vs_limit:ratio_rate5m',
+            expr: |||
+              sum by (%(clusterLabel)s, k8s_namespace_name, k8s_pod_name) (
+                max by (%(clusterLabel)s, k8s_namespace_name, k8s_pod_name) (
+                  rate(k8s_pod_cpu_time_seconds_total[5m])
+                )
+                /
+                (
+                  sum by (%(clusterLabel)s, k8s_namespace_name, k8s_pod_name) (
+                    max by (%(clusterLabel)s, k8s_namespace_name, k8s_pod_name, k8s_container_name) (
+                      k8s_container_cpu_limit
+                    )
+                  ) * on (%(clusterLabel)s, k8s_namespace_name, k8s_pod_name) group_left()
+                  clamp_max(
+                    max by (%(clusterLabel)s, k8s_namespace_name, k8s_pod_name) (
+                      (k8s_pod_phase == 1) or (k8s_pod_phase == 2)
+                    ), 1
+                  )
+                )
+              )
+            ||| % $._config,
+          },
+        ],
+      },
+    ],
+  },
+}

rules/rules.libsonnet

@@ -0,0 +1 @@
+(import 'namespace.libsonnet')