mac分析数据中cache是什么意思?

OSActivityID: 0x8000000000006320
com.apple.message.domain: com.apple.appextension.usagesummary
com.apple.message.__source__: SPI
com.apple.message.signature: com.apple.CacheDelete
com.apple.message.signature2: com.apple.cache_delete_extension
com.apple.message.signature3: com.apple.Safari.CacheDeleteExtension-15609
com.apple.message.summarize: YES
SenderMachUUID: 8C6D6A85-EBCC-307D-AFF6-EEAD2DCF5DF5

应该是在清理缓存的数据。