promisifiedAggregation(global.chooseDb(`metric`).collection(`releasesProd`), [
  {
    $project: {
      date: 1,
      _id: 0,
      number: 1,
      startDate: {$subtract: [`$date`, 1000 * 60 * 60 * 24 * 14]},
    },
  },
  {$sort: {number: 1}},
])
  .map(release =>
    Promise.all(
      promisifiedAggregation(
        global.chooseDb(`jmeter`).collection(`build_params`),
        [
          {
            $match: {
              executionDateUTC: {$gt: release.startDate, $lte: release.date},
            },
          },
          {$project: {id: 1, source: 1}},
          {$group: {id: `$source`, builds: {$push: `$_id`}}},
        ]
      ).map(build =>
        promisifiedAggregation(
          global.chooseDb(`jmeter`).collection(build.source),
          [
            {$match: {title: {$in: build.builds}}},
            {$project: {'all.count': 1, 'ko.count': 1, 'ok.count': 1}},
            {
              $group: {
                _id: build.source,
                success: {$sum: `$ok.count`},
                failure: {$sum: `$ko.count`},
                all: {$sum: `$all.count`},
              },
            },
          ]
        )
      )
    ).then(builds => ({releaseId: release.id, builds}))
  )
  .reduce((aggregation, {releaseId, builds}) =>
    Object.assign(aggregation, {[releaseId]: builds})
  );