Remove metrics: fallback, vsyscallCount and partialResult

The newly added Weirdness metric with fields should be used instead of them.

Simple query for weirdness metric: http://shortn/_DGNk0z2Up6

PiperOrigin-RevId: 370578132

pkg/metric/metric.go

@@ -37,7 +37,7 @@ var (
 	ErrInitializationDone = errors.New("metric cannot be created after initialization is complete")
 
 	// WeirdnessMetric is a metric with fields created to track the number
-	// of weird occurrences such as clock fallback, partial_result and
+	// of weird occurrences such as time fallback, partial_result and
 	// vsyscall count.
 	WeirdnessMetric *Uint64Metric
 )
@@ -392,9 +392,9 @@ func CreateSentryMetrics() {
 		return
 	}
 
-	WeirdnessMetric = MustCreateNewUint64Metric("/weirdness", true /* sync */, "Increment for weird occurrences of problems such as clock fallback, partial result and vsyscalls invoked in the sandbox",
+	WeirdnessMetric = MustCreateNewUint64Metric("/weirdness", true /* sync */, "Increment for weird occurrences of problems such as time fallback, partial result and vsyscalls invoked in the sandbox",
 		Field{
 			name:          "weirdness_type",
-			allowedValues: []string{"fallback", "partial_result", "vsyscall_count"},
+			allowedValues: []string{"time_fallback", "partial_result", "vsyscall_count"},
 		})
 }

pkg/sentry/kernel/task_syscall.go

@@ -30,8 +30,6 @@ import (
 	"gvisor.dev/gvisor/pkg/syserror"
 )
 
-var vsyscallCount = metric.MustCreateNewUint64Metric("/kernel/vsyscall_count", false /* sync */, "Number of times vsyscalls were invoked by the application")
-
 // SyscallRestartBlock represents the restart block for a syscall restartable
 // with a custom function. It encapsulates the state required to restart a
 // syscall across a S/R.
@@ -284,7 +282,6 @@ func (*runSyscallExit) execute(t *Task) taskRunState {
 // indicated by an execution fault at address addr. doVsyscall returns the
 // task's next run state.
 func (t *Task) doVsyscall(addr hostarch.Addr, sysno uintptr) taskRunState {
-	vsyscallCount.Increment()
 	metric.WeirdnessMetric.Increment("vsyscall_count")
 
 	// Grab the caller up front, to make sure there's a sensible stack.

pkg/sentry/syscalls/linux/error.go

@@ -29,8 +29,7 @@ import (
 )
 
 var (
-	partialResultMetric = metric.MustCreateNewUint64Metric("/syscalls/partial_result", true /* sync */, "Whether or not a partial result has occurred for this sandbox.")
-	partialResultOnce   sync.Once
+	partialResultOnce sync.Once
 )
 
 // incrementPartialResultMetric increments PartialResultMetric by calling
@@ -38,7 +37,6 @@ var (
 // us to pass a function which does not take any arguments, whereas Increment()
 // takes a variadic number of arguments.
 func incrementPartialResultMetric() {
-	partialResultMetric.Increment()
 	metric.WeirdnessMetric.Increment("partial_result")
 }
 

pkg/sentry/time/calibrated_clock.go

@@ -25,11 +25,6 @@ import (
 	"gvisor.dev/gvisor/pkg/syserror"
 )
 
-// fallbackMetric tracks failed updates. It is not sync, as it is not critical
-// that all occurrences are captured and CalibratedClock may fallback many
-// times.
-var fallbackMetric = metric.MustCreateNewUint64Metric("/time/fallback", false /* sync */, "Incremented when a clock falls back to system calls due to a failed update")
-
 // CalibratedClock implements a clock that tracks a reference clock.
 //
 // Users should call Update at regular intervals of around approxUpdateInterval
@@ -102,8 +97,7 @@ func (c *CalibratedClock) resetLocked(str string, v ...interface{}) {
 	c.Warningf(str+" Resetting clock; time may jump.", v...)
 	c.ready = false
 	c.ref.Reset()
-	fallbackMetric.Increment()
-	metric.WeirdnessMetric.Increment("fallback")
+	metric.WeirdnessMetric.Increment("time_fallback")
 }
 
 // updateParams updates the timekeeping parameters based on the passed