Add pprof for profiling (#1033)

* Add pprof for profiling

We have received reports of excessive memory usage for the exporter. Pprof provides a mechanism for users to dump the heap which should provide useful information about what memory has been allocated.

Signed-off-by: Joe Adams <github@joeadams.io>

* Update main.go

Co-authored-by: Ben Kochie <superq@gmail.com>
Signed-off-by: Joe Adams <github@joeadams.io>

---------

Signed-off-by: Joe Adams <github@joeadams.io>
Co-authored-by: Ben Kochie <superq@gmail.com>

Author: sysadmind

main.go

@@ -18,6 +18,7 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	_ "net/http/pprof"
 	"net/url"
 	"os"
 	"os/signal"