Strategic Project Metrics
As a CIO or CTO I would prefer six or less metrics that are true indicators of organizational performance and execution.
If the PMO does not use critical chain project management then I will not trust percentage complete metrics as they will usually be skewed and not tell the real story with issues.
Be careful using the distribution of projects by RAG (red/amber/green) status is out-of-date mostly do to the subjective nature of the distribution.
I like to focus on before the fact metrics that address unique organizational constraints and help the org elevate and diminish them preemptively.