Function fetchMetrics

packages/cli/src/utils/metrics.ts:33–58

(
  port: number,
  timeoutMs: number = METRICS_FETCH_TIMEOUT_MS
)

/** Fetch resource metrics from the Jupyter server */
export async function fetchMetrics(
  port: number,
  timeoutMs: number = METRICS_FETCH_TIMEOUT_MS
): Promise<JupyterMetricsResponse | null> {
  const controller = new AbortController()
  const timeoutId = setTimeout(() => controller.abort(), timeoutMs)

  try {
    const response = await fetch(`http://localhost:${port}/api/metrics/v1`, {
      signal: controller.signal,
    })
    clearTimeout(timeoutId)
    if (!response.ok) return null
    const json = await response.json()
    const result = JupyterMetricsResponseSchema.safeParse(json)
    if (!result.success) {
      debug(`Schema validation failed: ${result.error.message}`)
      return null
    }
    return result.data
  } catch (error) {
    clearTimeout(timeoutId)
    debug(`Failed to fetch metrics: ${error instanceof Error ? error.message : String(error)}`)
    return null
  }
}

/** Format bytes as human-readable string */
export function formatBytes(bytes: number): string {