adding design proposal for the management cluster reconciler #12
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Signed-off-by: Joydeep Banerjee <[email protected]>
yasun1
reviewed
Oct 31, 2025
| ``` | ||
| Current: 85% capacity | ||
| Threshold: 90% capacity | ||
| Action: Wait until threshold is hit, then provision new cluster |
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90% capacity, it could refer to "90% of the capacity" or "90% remaining". Maybe the word utilization is better than capacity.
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Agreed. Utilization is better. Thanks.
| Each management cluster has a finite capacity for hosted control planes, determined by both resource constraints (CPU, memory) and infrastructure limitations (VPC limits, network capacity, etc.). When we approach this capacity limit, we need to create a new management cluster. Creating this management cluster takes time. Therefore we need to be ready in advance - just in time though to avoid wasting of resources. | ||
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| ## SLO Constraints | ||
| - **Hosted cluster provisioning SLO:** 10 minutes (hard requirement - cannot be broken) |
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What is the definition for this SLO? I am also curious how the 10 minutes comes?
| Demand Analysis: Monday spikes average 12-18 clusters | ||
| Sizing Decision: Provision larger clusters (25 capacity) vs standard (15 capacity) | ||
| Trade-off: Less frequent provisioning vs potential over-provisioning | ||
| ``` |
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The current examples focus solely on proactive provisioning (Scale Up) to meet the SLO. To fully address the Secondary Objective (Cost Optimization) of minimizing unused capacity, is it better to add a scenario demonstrating Scale Down / Resource Reclamation?
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As we have been discussing, here is the initial proposal for the Management Cluster Reconciler.