Alexey Serbin has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/19392 )

Change subject: [www] add slow scans section
......................................................................

[www] add slow scans section

We can get the history of completed scans from /scans page right now.
But it is not easy to distinguish slow ones among those.

I introduced an extra section to the scan page to show slow scans
separately. A scan is called 'slow' if it takes more time than defined
by --slow_scanner_threshold_ms.
The number of elements in the slow scans history is limited by
--slow_scan_history_count.

Change-Id: Ibd1dcac8b81c5eefd306e7020c9c52b3f28e603c
Reviewed-on: http://gerrit.cloudera.org:8080/19392
Tested-by: Kudu Jenkins
Reviewed-by: Alexey Serbin <[email protected]>
---
M src/kudu/client/scan_token-test.cc
M src/kudu/tserver/scanners.cc
M src/kudu/tserver/scanners.h
M src/kudu/tserver/tablet_server-test.cc
M src/kudu/tserver/tablet_server.cc
M src/kudu/tserver/tserver_path_handlers.cc
M www/scans.mustache
7 files changed, 379 insertions(+), 102 deletions(-)

Approvals:
  Kudu Jenkins: Verified
  Alexey Serbin: Looks good to me, approved

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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: Ibd1dcac8b81c5eefd306e7020c9c52b3f28e603c
Gerrit-Change-Number: 19392
Gerrit-PatchSet: 16
Gerrit-Owner: KeDeng <[email protected]>
Gerrit-Reviewer: Alexey Serbin <[email protected]>
Gerrit-Reviewer: KeDeng <[email protected]>
Gerrit-Reviewer: Kudu Jenkins (120)

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