Connector docs — Vertex AI / Gemini

Exactly what CostMon asks for to read Vertex AI / Gemini

CostMon reads the same FOCUS-formatted GCP billing export as the gcp connector, filtered to Vertex AI / Generative Language services, and joins it with Cloud Monitoring's per-model token metrics.

See the security model →See the solution page →

What CostMon calls

The literal API surface, nothing more

BigQuery — Jobs.query: Billing export filtered to Vertex AI / generative services, grouped by model.
Cloud Monitoring — TimeSeries.list: Per-model token counts from aiplatform.googleapis.com/publisher/online_serving/token_count.

What you supply

Credential and config fields

service_account_jsonService account JSON keysecretrequired

Read-only: roles/bigquery.dataViewer + jobUser on the billing project, roles/monitoring.viewer

project_idProject IDrequired

datasetBilling export datasetrequired

tableBilling export tablerequired

Minimum permission

Copy this, not a broader role

Minimum IAM roles

roles/bigquery.dataViewer   — on the dataset holding your billing export
roles/bigquery.jobUser      — on the project, to run the read query
roles/monitoring.viewer     — on the project, for per-model token metrics

Scope of access

What Vertex AI / Gemini access can't reach

Prompts, completions, or any model input/output content
Any GCP resource outside the billing export and Cloud Monitoring metrics

Worth knowing

Dollars come from the GCP FOCUS billing export filtered to Vertex AI; per-model token counts come from Cloud Monitoring and degrade to cost-only if that metric is unavailable.

FAQ

Common questions about the Vertex AI / Gemini connector

Is this a separate billing export from the gcp connector?

No, it can be the same export. This connector filters it down to Vertex AI / generative services and adds a Cloud Monitoring token join on top.

What if Cloud Monitoring doesn't have the token metric?

Rows still sync from the billing export. You lose per-model token counts, not the cost, the same degrade-gracefully behavior as the Bedrock connector.

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