Looking at integration-slave1006 there are 100s of files in /tmp with the pattern site-<number>.json. It started November 27th, and since then a handful are added each day. Many more in recent days.
-rw-r--r-- 1 jenkins-deploy wikidev 578 Nov 27 22:41 sites-1417128107.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Nov 27 23:17 sites-1417130253.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Nov 28 01:55 sites-1417139706.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Nov 28 01:55 sites-1417139707.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Nov 28 02:47 sites-1417142864.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Nov 28 08:28 sites-1417163296.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Nov 28 08:52 sites-1417164756.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Nov 28 10:40 sites-1417171206.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Nov 28 16:26 sites-1417191989.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Nov 28 17:00 sites-1417194001.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Nov 28 18:55 sites-1417200948.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Nov 29 11:22 sites-1417260130.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Nov 29 11:22 sites-1417260131.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Nov 30 05:31 sites-1417325459.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Nov 30 05:31 sites-1417325460.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Nov 30 18:18 sites-1417371499.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Nov 30 20:51 sites-1417380680.json .. -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 00:46 sites-1418863574.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 00:46 sites-1418863581.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 01:04 sites-1418864688.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 01:53 sites-1418867595.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 01:53 sites-1418867596.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 06:10 sites-1418883048.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 07:03 sites-1418886232.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 09:11 sites-1418893908.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 09:18 sites-1418894298.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 09:18 sites-1418894299.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 09:45 sites-1418895942.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 11:42 sites-1418902940.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 12:29 sites-1418905781.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 13:17 sites-1418908648.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 13:31 sites-1418909461.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 15:32 sites-1418916777.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 16:01 sites-1418918502.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 16:11 sites-1418919087.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 16:23 sites-1418919799.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 16:33 sites-1418920410.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 16:35 sites-1418920548.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 16:37 sites-1418920667.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 16:39 sites-1418920799.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 16:40 sites-1418920800.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 16:41 sites-1418920895.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 16:41 sites-1418920896.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 16:55 sites-1418921756.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 17:00 sites-1418922057.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 17:02 sites-1418922124.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 17:03 sites-1418922210.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 17:09 sites-1418922544.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 17:16 sites-1418922971.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 17:20 sites-1418923253.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 17:26 sites-1418923617.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 17:51 sites-1418925116.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 17:51 sites-1418925117.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 17:51 sites-1418925119.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 17:55 sites-1418925354.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 18:30 sites-1418927451.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 18:39 sites-1418927945.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 18:39 sites-1418927982.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 18:39 sites-1418927984.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 19:28 sites-1418930889.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 18 19:28 sites-1418930891.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 19 00:46 sites-1418949987.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 19 00:46 sites-1418949988.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 19 01:03 sites-1418951023.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 19 01:03 sites-1418951026.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 19 01:16 sites-1418951763.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 19 01:35 sites-1418952956.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 19 01:43 sites-1418953402.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 19 01:44 sites-1418953468.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 19 01:49 sites-1418953782.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 19 02:37 sites-1418956659.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 19 02:42 sites-1418956974.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 19 02:46 sites-1418957199.json -rw-r--r-- 1 jenkins-deploy wikidev 578 Dec 19 04:10 sites-1418962246.json
They all contain (almost?) the same content:
{"sites":{"foobar":{"globalid":"foobar","type":"unknown","group":"none","source":"local","language":null,"localids":[],"config":[],"data":[],"forward":false,"internalid":null,"identifiers":[]},
"enwiktionary":{"globalid":"enwiktionary","type":"mediawiki","group":"wiktionary","source":"local","language":"en","localids":{"equivalent":["enwiktionary"]},"config":[],"data":{"paths":{
"page_path":"https:\/\/en.wiktionary.org\/wiki\/$1","file_path":"https:\/\/en.wiktionary.org\/w\/$1"}},"forward":false,"internalid":null,"identifiers":[{"type":"equivalent","key":"enwiktionary"}]}}}