Function RecommendedShardCount

internal/fluxshardoperator/placement.go:218–231

RecommendedShardCount is the raw autosizing formula: K = clamp(ceil(H / hrTargetPerShard), 1, min(maxAutoShards, T)).

(helmReleases, tenants int)

// RecommendedShardCount is the raw autosizing formula:
// K = clamp(ceil(H / hrTargetPerShard), 1, min(maxAutoShards, T)).
func RecommendedShardCount(helmReleases, tenants int) int {
	k := (helmReleases + hrTargetPerShard - 1) / hrTargetPerShard
	if k < 1 {
		k = 1
	}
	limit := maxAutoShards
	if tenants > 0 && tenants < limit {
		limit = tenants
	}
	if k > limit {
		k = limit
	}
	return k
}

// EffectiveShardCount resolves the shard count for this sync. Explicit
// configuration wins; in auto mode the recommendation is applied with