gke-cost-analysis

GKE Cost Analysis

This skill provides guidance on answering natural language questions about GKE-related costs, optimization, or billing.

Overview

When users ask about GKE costs (e.g., "What are my costs across projects?", "What's my most expensive namespace?"), use this skill to provide a structured and expert response.

Instructions

When handling a cost-related question:

1. Provide a Direct Answer: Address the specific cost question or optimization request.
2. Explain BigQuery Integration: Explain how to use BigQuery for cost analysis if relevant. Mention that GKE costs come from GCP Billing Detailed BigQuery Export.
3. Check Cost Allocation: Mention that GKE Cost Allocation must be enabled for namespace and workload-level cost data.
4. Provide Actionable Steps: Provide concrete next steps or commands when possible. Prefer BigQuery CLI (bq) over BigQuery Studio when available.
5. Reference Resources: Point to relevant GCP documentation or console links.

Key Points to Remember

• Data Source: GKE costs come from GCP Billing Detailed BigQuery Export. The user must provide the full path to their BigQuery table (dataset name and table name containing Billing Account ID).
• Granularity: GKE Cost Allocation must be enabled for namespace and workload-level cost data.
• Tools: BigQuery CLI (bq) is preferred. When writing Standard SQL queries, use a dot (.) instead of a colon (:) to separate the project ID and dataset name.
• Defaults: Assume last 30 days, row limit 10, ordering by cost descending, unless specified otherwise.

Example BigQuery Queries

Use these queries as templates to answer questions. All parameters (dataset, table, project, cluster, etc.) need to be replaced.

Cost of a Single Workload in a Single Cluster

bq query --nouse_legacy_sql '
SELECT
  SUM(cost) + SUM(IFNULL((SELECT SUM(c.amount) FROM UNNEST(credits) c), 0)) AS cost,
  SUM(cost) AS cost_before_credits
FROM {{.BQDatasetProjectID}}.{{.BQDatasetName}}.gcp_billing_export_resource_v1_XXXXXX_XXXXXX_XXXXXX AS bqe
WHERE _PARTITIONTIME >= TIMESTAMP_SUB(CURRENT_TIMESTAMP(), INTERVAL 30 DAY)
  AND project.id = "sample-project-id"
  AND EXISTS(SELECT * FROM bqe.labels AS l WHERE l.key = "goog-k8s-cluster-location" AND l.value = "us-central1")
  AND EXISTS(SELECT * FROM bqe.labels AS l WHERE l.key = "goog-k8s-cluster-name" AND l.value = "sample-cluster-name")
  AND EXISTS(SELECT * FROM bqe.labels AS l WHERE l.key = "k8s-namespace" AND l.value = "sample-namespace")
  AND EXISTS(SELECT * FROM bqe.labels AS l WHERE l.key = "k8s-workload-type" AND l.value = "apps/v1-Deployment")
  AND EXISTS(SELECT * FROM bqe.labels AS l WHERE l.key = "k8s-workload-name" AND l.value = "sample-workload-name")
;
'

Cost of Each Workload in Each Cluster

bq query --nouse_legacy_sql '
SELECT
  project.id AS project_id,
  (SELECT l.value FROM bqe.labels AS l WHERE l.key = "goog-k8s-cluster-location" LIMIT 1) AS cluster_location,
  (SELECT l.value FROM bqe.labels AS l WHERE l.key = "goog-k8s-cluster-name" LIMIT 1) AS cluster_name,
  (SELECT l.value FROM bqe.labels AS l WHERE l.key = "k8s-namespace" LIMIT 1) AS k8s_namespace,
  (SELECT l.value FROM bqe.labels AS l WHERE l.key = "k8s-workload-type" LIMIT 1) AS k8s_workload_type,
  (SELECT l.value FROM bqe.labels AS l WHERE l.key = "k8s-workload-name" LIMIT 1) AS k8s_workload_name,
  SUM(cost) + SUM(IFNULL((SELECT SUM(c.amount) FROM UNNEST(credits) c), 0)) AS cost,
  SUM(cost) AS cost_before_credits
FROM {{.BQDatasetProjectID}}.{{.BQDatasetName}}.gcp_billing_export_resource_v1_XXXXXX_XXXXXX_XXXXXX AS bqe
WHERE _PARTITIONTIME >= TIMESTAMP_SUB(CURRENT_TIMESTAMP(), INTERVAL 30 DAY)
  AND EXISTS(SELECT * FROM bqe.labels AS l WHERE l.key = "goog-k8s-cluster-name")
GROUP BY 1, 2, 3, 4, 5, 6
ORDER BY 7 DESC
LIMIT 10
;
'

Note: Checking that the "goog-k8s-cluster-name" label exists scopes the total billing data to just GKE costs.