feat: Add SystemCalls and Interrupts support for AIX load metrics#1981
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Description
Add support for
SystemCalls()andInterrupts()functions for AIX platform to retrieve system calls and interrupt counts since boot.Part 3 of splitting #1969: load package
Depends on #1979 #1980
Changes
SystemCalls()andInterrupts()functions toload_aix.gothat delegate to context-aware implementationsSystemCallsWithContext()andInterruptsWithContext()inload_aix_nocgo.gousing vmstat commandparseVmstatLine()helper function to parse vmstat output and extract context switches, interrupts, and syscallsgetVmstatMetrics()helper function for shared metric extraction logictestInvokerandgetInvoker()for better testabilityAvgWithContext()to use the newgetInvoker()abstractionMiscWithContext()to properly parse AIX process states (A, I, W, T, Z) and populate context switches from vmstatTesting
Changes have been validated with gofmt and golangci-lint.