Add pushover notifications, this should be a super basic MVP

vendor/github.com/dgraph-io/ristretto/z/calloc.go

@@ -0,0 +1,42 @@
+package z
+
+import "sync/atomic"
+
+var numBytes int64
+
+// NumAllocBytes returns the number of bytes allocated using calls to z.Calloc. The allocations
+// could be happening via either Go or jemalloc, depending upon the build flags.
+func NumAllocBytes() int64 {
+	return atomic.LoadInt64(&numBytes)
+}
+
+// MemStats is used to fetch JE Malloc Stats. The stats are fetched from
+// the mallctl namespace http://jemalloc.net/jemalloc.3.html#mallctl_namespace.
+type MemStats struct {
+	// Total number of bytes allocated by the application.
+	// http://jemalloc.net/jemalloc.3.html#stats.allocated
+	Allocated uint64
+	// Total number of bytes in active pages allocated by the application. This
+	// is a multiple of the page size, and greater than or equal to
+	// Allocated.
+	// http://jemalloc.net/jemalloc.3.html#stats.active
+	Active uint64
+	// Maximum number of bytes in physically resident data pages mapped by the
+	// allocator, comprising all pages dedicated to allocator metadata, pages
+	// backing active allocations, and unused dirty pages. This is a maximum
+	// rather than precise because pages may not actually be physically
+	// resident if they correspond to demand-zeroed virtual memory that has not
+	// yet been touched. This is a multiple of the page size, and is larger
+	// than stats.active.
+	// http://jemalloc.net/jemalloc.3.html#stats.resident
+	Resident uint64
+	// Total number of bytes in virtual memory mappings that were retained
+	// rather than being returned to the operating system via e.g. munmap(2) or
+	// similar. Retained virtual memory is typically untouched, decommitted, or
+	// purged, so it has no strongly associated physical memory (see extent
+	// hooks http://jemalloc.net/jemalloc.3.html#arena.i.extent_hooks for
+	// details). Retained memory is excluded from mapped memory statistics,
+	// e.g. stats.mapped (http://jemalloc.net/jemalloc.3.html#stats.mapped).
+	// http://jemalloc.net/jemalloc.3.html#stats.retained
+	Retained uint64
+}