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2.4.5. Management of Evolution within a PMDA

Evolution of a PMDA, or more particularly the underlying instrumentation to which it provides access, over time naturally results in the appearance of new metrics and the disappearance of old metrics. This creates potential problems for PMAPI clients and PCP tools that may be required to interact with both new and former versions of the PMDA.
The following guidelines are intended to help reduce the complexity of implementing a PMDA in the face of evolutionary change, while maintaining predictability and semantic coherence for tools using the PMAPI, and for end users of those tools.