This PmTcaScheme value specifies how the statistic(s) identified by cienaCesPmAdjustmentTcaStats are combined or interpreted by the Adjustment TCA feature for this instance, per its DESCRIPTION. Because a PM profile can expose several related statistics at once (for instance several error counters in the same Current Bin), this scheme is what decides whether Adjustment TCA logic treats them individually, sums them, or picks a worst-case among them, which materially changes how sensitive the same threshold configuration is in practice. For example, a sum scheme over three related error counters will cross a given threshold sooner than a scheme that only looks at the single worst offender among the same three counters.