vSphere extended metrics switched from `gauge` type to `rate` in 5.7.0

vsphere.cpu.capacity.contention vsphere.cpu.capacity.demand vsphere.cpu.capacity.usage vsphere.cpu.coreUtilization vsphere.cpu.corecount.contention vsphere.cpu.demand vsphere.cpu.totalmhz vsphere.cpu.usage vsphere.cpu.usagemhz vsphere.cpu.utilization vsphere.datastore.numberReadAveraged vsphere.datastore.numberWriteAveraged vsphere.datastore.read vsphere.datastore.write vsphere.disk.commandsAveraged vsphere.disk.numberReadAveraged vsphere.disk.numberWriteAveraged vsphere.disk.read vsphere.disk.throughput.usage vsphere.disk.usage vsphere.disk.write vsphere.hbr.hbrNetRx vsphere.hbr.hbrNetTx vsphere.managementAgent.cpuUsage vsphere.managementAgent.swapIn vsphere.managementAgent.swapOut vsphere.mem.capacity.contention vsphere.mem.compressionRate vsphere.mem.decompressionRate vsphere.mem.llSwapInRate vsphere.mem.llSwapOutRate vsphere.mem.swapinRate vsphere.mem.swapoutRate vsphere.network.bytesRx vsphere.network.bytesTx vsphere.network.received vsphere.network.throughput.packetsPerSec vsphere.network.throughput.usage vsphere.network.throughput.usage.ft vsphere.network.throughput.usage.hbr vsphere.network.throughput.usage.iscsi vsphere.network.throughput.usage.nfs vsphere.network.throughput.usage.vm vsphere.network.throughput.usage.vmotion vsphere.network.transmitted vsphere.network.usage vsphere.storageAdapter.commandsAveraged vsphere.storageAdapter.numberReadAveraged vsphere.storageAdapter.numberWriteAveraged vsphere.storageAdapter.read vsphere.storageAdapter.throughput.usag vsphere.storageAdapter.write vsphere.storagePath.commandsAveraged vsphere.storagePath.numberReadAveraged vsphere.storagePath.numberWriteAveraged vsphere.storagePath.read vsphere.storagePath.throughput.usage vsphere.storagePath.write vsphere.virtualDisk.numberReadAveraged vsphere.virtualDisk.numberWriteAveraged vsphere.virtualDisk.read vsphere.virtualDisk.throughput.usage vsphere.virtualDisk.write