diff --git a/libraries/logger/.eslintrc b/libraries/logger/.eslintrc
new file mode 100644
index 0000000000..3efdae4f58
--- /dev/null
+++ b/libraries/logger/.eslintrc
@@ -0,0 +1,38 @@
+{
+  "extends": [
+    "standard",
+    "prettier",
+    "prettier/standard"
+  ],
+  "plugins": [
+    "mocha",
+    "chai-expect",
+    "chai-friendly"
+  ],
+  "env": {
+    "mocha": true
+  },
+  "globals": {
+    "expect": true,
+    "define": true,
+  },
+  "settings": {
+  },
+  "rules": {
+    // Add some mocha specific rules
+    "mocha/handle-done-callback": "error",
+    "mocha/no-exclusive-tests": "error",
+    "mocha/no-global-tests": "error",
+    "mocha/no-identical-title": "error",
+    "mocha/no-nested-tests": "error",
+    "mocha/no-pending-tests": "error",
+    "mocha/no-skipped-tests": "error",
+
+    // Add some chai specific rules
+    "chai-expect/missing-assertion": "error",
+    "chai-expect/terminating-properties": "error",
+    // Swap the no-unused-expressions rule with a more chai-friendly one
+    "no-unused-expressions": 0,
+    "chai-friendly/no-unused-expressions": "error"
+  }
+}
diff --git a/libraries/logger/.gitignore b/libraries/logger/.gitignore
new file mode 100644
index 0000000000..cbf8548194
--- /dev/null
+++ b/libraries/logger/.gitignore
@@ -0,0 +1,4 @@
+node_modules
+
+.npmrc
+Dockerfile
diff --git a/libraries/logger/.prettierrc b/libraries/logger/.prettierrc
new file mode 100644
index 0000000000..b2095be81e
--- /dev/null
+++ b/libraries/logger/.prettierrc
@@ -0,0 +1,4 @@
+{
+  "semi": false,
+  "singleQuote": true
+}
diff --git a/libraries/logger/LICENSE.txt b/libraries/logger/LICENSE.txt
new file mode 100644
index 0000000000..dba13ed2dd
--- /dev/null
+++ b/libraries/logger/LICENSE.txt
@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
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+following paragraph.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the work with which it is combined will remain governed by version
+3 of the GNU General Public License.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU Affero General Public License from time to time.  Such new versions
+will be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU Affero General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU Affero General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU Affero General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<http://www.gnu.org/licenses/>.
diff --git a/libraries/logger/index.js b/libraries/logger/index.js
new file mode 100755
index 0000000000..6cd6f9ef8b
--- /dev/null
+++ b/libraries/logger/index.js
@@ -0,0 +1 @@
+module.exports = require('./logging-manager.js')
diff --git a/libraries/logger/logging-manager.js b/libraries/logger/logging-manager.js
new file mode 100644
index 0000000000..4351722209
--- /dev/null
+++ b/libraries/logger/logging-manager.js
@@ -0,0 +1,279 @@
+const bunyan = require('bunyan')
+const fetch = require('node-fetch')
+const fs = require('fs')
+const yn = require('yn')
+const OError = require('@overleaf/o-error')
+const GCPLogging = require('@google-cloud/logging-bunyan')
+
+// bunyan error serializer
+const errSerializer = function (err) {
+  if (!err || !err.stack) {
+    return err
+  }
+  return {
+    message: err.message,
+    name: err.name,
+    stack: OError.getFullStack(err),
+    info: OError.getFullInfo(err),
+    code: err.code,
+    signal: err.signal
+  }
+}
+
+const Logger = (module.exports = {
+  initialize(name) {
+    this.logLevelSource = (process.env.LOG_LEVEL_SOURCE || 'file').toLowerCase()
+    this.isProduction =
+      (process.env.NODE_ENV || '').toLowerCase() === 'production'
+    this.defaultLevel =
+      process.env.LOG_LEVEL || (this.isProduction ? 'warn' : 'debug')
+    this.loggerName = name
+    this.logger = bunyan.createLogger({
+      name,
+      serializers: {
+        err: errSerializer,
+        req: bunyan.stdSerializers.req,
+        res: bunyan.stdSerializers.res
+      },
+      streams: [{ level: this.defaultLevel, stream: process.stdout }]
+    })
+    this._setupRingBuffer()
+    this._setupStackdriver()
+    this._setupLogLevelChecker()
+    return this
+  },
+
+  async checkLogLevel() {
+    try {
+      const end = await this.getTracingEndTime()
+      if (parseInt(end, 10) > Date.now()) {
+        this.logger.level('trace')
+      } else {
+        this.logger.level(this.defaultLevel)
+      }
+    } catch (err) {
+      this.logger.level(this.defaultLevel)
+    }
+  },
+
+  async getTracingEndTimeFile() {
+    return fs.promises.readFile('/logging/tracingEndTime')
+  },
+
+  async getTracingEndTimeMetadata() {
+    const options = {
+      headers: {
+        'Metadata-Flavor': 'Google'
+      }
+    }
+    const uri = `http://metadata.google.internal/computeMetadata/v1/project/attributes/${this.loggerName}-setLogLevelEndTime`
+    const res = await fetch(uri, options)
+    if (!res.ok) throw new Error('Metadata not okay')
+    return res.text()
+  },
+
+  initializeErrorReporting(sentryDsn, options) {
+    const raven = require('raven')
+    this.raven = new raven.Client(sentryDsn, options)
+    this.lastErrorTimeStamp = 0 // for rate limiting on sentry reporting
+    this.lastErrorCount = 0
+  },
+
+  captureException(attributes, message, level) {
+    // handle case of logger.error "message"
+    let key, value
+    if (typeof attributes === 'string') {
+      attributes = { err: new Error(attributes) }
+    }
+    // extract any error object
+    let error = attributes.err || attributes.error
+    // avoid reporting errors twice
+    for (key in attributes) {
+      value = attributes[key]
+      if (value instanceof Error && value.reportedToSentry) {
+        return
+      }
+    }
+    // include our log message in the error report
+    if (error == null) {
+      if (typeof message === 'string') {
+        error = { message }
+      }
+    } else if (message != null) {
+      attributes.description = message
+    }
+    // report the error
+    if (error != null) {
+      // capture attributes and use *_id objects as tags
+      const tags = {}
+      const extra = {}
+      for (key in attributes) {
+        value = attributes[key]
+        if (key.match(/_id/) && typeof value === 'string') {
+          tags[key] = value
+        }
+        extra[key] = value
+      }
+      // capture req object if available
+      const { req } = attributes
+      if (req != null) {
+        extra.req = {
+          method: req.method,
+          url: req.originalUrl,
+          query: req.query,
+          headers: req.headers,
+          ip: req.ip
+        }
+      }
+      // recreate error objects that have been converted to a normal object
+      if (!(error instanceof Error) && typeof error === 'object') {
+        const newError = new Error(error.message)
+        for (key of Object.keys(error || {})) {
+          value = error[key]
+          newError[key] = value
+        }
+        error = newError
+      }
+      // filter paths from the message to avoid duplicate errors in sentry
+      // (e.g. errors from `fs` methods which have a path attribute)
+      try {
+        if (error.path) {
+          error.message = error.message.replace(` '${error.path}'`, '')
+        }
+
+        // send the error to sentry
+        this.raven.captureException(error, { tags, extra, level })
+
+        // put a flag on the errors to avoid reporting them multiple times
+        for (key in attributes) {
+          value = attributes[key]
+          if (value instanceof Error) {
+            value.reportedToSentry = true
+          }
+        }
+      } catch (err) {
+        // ignore Raven errors
+      }
+    }
+  },
+
+  debug() {
+    return this.logger.debug.apply(this.logger, arguments)
+  },
+
+  info() {
+    return this.logger.info.apply(this.logger, arguments)
+  },
+
+  log() {
+    return this.logger.info.apply(this.logger, arguments)
+  },
+
+  error(attributes, message, ...args) {
+    if (this.ringBuffer !== null && Array.isArray(this.ringBuffer.records)) {
+      attributes.logBuffer = this.ringBuffer.records.filter(function (record) {
+        return record.level !== 50
+      })
+    }
+    this.logger.error(attributes, message, ...Array.from(args))
+    if (this.raven != null) {
+      const MAX_ERRORS = 5 // maximum number of errors in 1 minute
+      const now = new Date()
+      // have we recently reported an error?
+      const recentSentryReport = now - this.lastErrorTimeStamp < 60 * 1000
+      // if so, increment the error count
+      if (recentSentryReport) {
+        this.lastErrorCount++
+      } else {
+        this.lastErrorCount = 0
+        this.lastErrorTimeStamp = now
+      }
+      // only report 5 errors every minute to avoid overload
+      if (this.lastErrorCount < MAX_ERRORS) {
+        // add a note if the rate limit has been hit
+        const note =
+          this.lastErrorCount + 1 === MAX_ERRORS ? '(rate limited)' : ''
+        // report the exception
+        return this.captureException(attributes, message, `error${note}`)
+      }
+    }
+  },
+
+  err() {
+    return this.error.apply(this, arguments)
+  },
+
+  warn() {
+    return this.logger.warn.apply(this.logger, arguments)
+  },
+
+  fatal(attributes, message, callback) {
+    if (callback == null) {
+      callback = function () {}
+    }
+    this.logger.fatal(attributes, message)
+    if (this.raven != null) {
+      var cb = function (e) {
+        // call the callback once after 'logged' or 'error' event
+        callback()
+        return (cb = function () {})
+      }
+      this.captureException(attributes, message, 'fatal')
+      this.raven.once('logged', cb)
+      return this.raven.once('error', cb)
+    } else {
+      return callback()
+    }
+  },
+
+  _setupRingBuffer() {
+    this.ringBufferSize = parseInt(process.env.LOG_RING_BUFFER_SIZE) || 0
+    if (this.ringBufferSize > 0) {
+      this.ringBuffer = new bunyan.RingBuffer({ limit: this.ringBufferSize })
+      this.logger.addStream({
+        level: 'trace',
+        type: 'raw',
+        stream: this.ringBuffer
+      })
+    } else {
+      this.ringBuffer = null
+    }
+  },
+
+  _setupStackdriver() {
+    const stackdriverEnabled = yn(process.env.STACKDRIVER_LOGGING)
+    if (!stackdriverEnabled) {
+      return
+    }
+    const stackdriverClient = new GCPLogging.LoggingBunyan({
+      logName: this.loggerName,
+      serviceContext: { service: this.loggerName }
+    })
+    this.logger.addStream(stackdriverClient.stream(this.defaultLevel))
+  },
+
+  _setupLogLevelChecker() {
+    if (this.isProduction) {
+      // clear interval if already set
+      if (this.checkInterval) {
+        clearInterval(this.checkInterval)
+      }
+      if (this.logLevelSource === 'file') {
+        this.getTracingEndTime = this.getTracingEndTimeFile
+      } else if (this.logLevelSource === 'gce_metadata') {
+        this.getTracingEndTime = this.getTracingEndTimeMetadata
+      } else if (this.logLevelSource === 'none') {
+        return
+      } else {
+        console.log('Unrecognised log level source')
+        return
+      }
+      // check for log level override on startup
+      this.checkLogLevel()
+      // re-check log level every minute
+      this.checkInterval = setInterval(this.checkLogLevel.bind(this), 1000 * 60)
+    }
+  }
+})
+
+Logger.initialize('default-sharelatex')
diff --git a/libraries/logger/package-lock.json b/libraries/logger/package-lock.json
new file mode 100644
index 0000000000..fb0c5617bc
--- /dev/null
+++ b/libraries/logger/package-lock.json
@@ -0,0 +1,4566 @@
+{
+  "name": "logger-sharelatex",
+  "version": "2.2.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.10.4.tgz",
+      "integrity": "sha512-vG6SvB6oYEhvgisZNFRmRCUkLz11c7rp+tbNTynGqc6mS1d5ATd/sGyV6W0KZZnXRKMTzZDRgQT3Ou9jhpAfUg==",
+      "dev": true,
+      "requires": {
+        "@babel/highlight": "^7.10.4"
+      }
+    },
+    "@babel/helper-validator-identifier": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.10.4.tgz",
+      "integrity": "sha512-3U9y+43hz7ZM+rzG24Qe2mufW5KhvFg/NhnNph+i9mgCtdTCtMJuI1TMkrIUiK7Ix4PYlRF9I5dhqaLYA/ADXw==",
+      "dev": true
+    },
+    "@babel/highlight": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.10.4.tgz",
+      "integrity": "sha512-i6rgnR/YgPEQzZZnbTHHuZdlE8qyoBNalD6F+q4vAFlcMEcqmkoG+mPqJYJCo63qPf74+Y1UZsl3l6f7/RIkmA==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-validator-identifier": "^7.10.4",
+        "chalk": "^2.0.0",
+        "js-tokens": "^4.0.0"
+      }
+    },
+    "@google-cloud/common": {
+      "version": "2.4.0",
+      "resolved": "https://registry.npmjs.org/@google-cloud/common/-/common-2.4.0.tgz",
+      "integrity": "sha512-zWFjBS35eI9leAHhjfeOYlK5Plcuj/77EzstnrJIZbKgF/nkqjcQuGiMCpzCwOfPyUbz8ZaEOYgbHa759AKbjg==",
+      "requires": {
+        "@google-cloud/projectify": "^1.0.0",
+        "@google-cloud/promisify": "^1.0.0",
+        "arrify": "^2.0.0",
+        "duplexify": "^3.6.0",
+        "ent": "^2.2.0",
+        "extend": "^3.0.2",
+        "google-auth-library": "^5.5.0",
+        "retry-request": "^4.0.0",
+        "teeny-request": "^6.0.0"
+      },
+      "dependencies": {
+        "google-auth-library": {
+          "version": "5.10.1",
+          "resolved": "https://registry.npmjs.org/google-auth-library/-/google-auth-library-5.10.1.tgz",
+          "integrity": "sha512-rOlaok5vlpV9rSiUu5EpR0vVpc+PhN62oF4RyX/6++DG1VsaulAFEMlDYBLjJDDPI6OcNOCGAKy9UVB/3NIDXg==",
+          "requires": {
+            "arrify": "^2.0.0",
+            "base64-js": "^1.3.0",
+            "ecdsa-sig-formatter": "^1.0.11",
+            "fast-text-encoding": "^1.0.0",
+            "gaxios": "^2.1.0",
+            "gcp-metadata": "^3.4.0",
+            "gtoken": "^4.1.0",
+            "jws": "^4.0.0",
+            "lru-cache": "^5.0.0"
+          }
+        }
+      }
+    },
+    "@google-cloud/logging": {
+      "version": "7.3.0",
+      "resolved": "https://registry.npmjs.org/@google-cloud/logging/-/logging-7.3.0.tgz",
+      "integrity": "sha512-xTW1V4MKpYC0mjSugyuiyUoZ9g6A42IhrrO3z7Tt3SmAb2IRj2Gf4RLoguKKncs340ooZFXrrVN/++t2Aj5zgg==",
+      "requires": {
+        "@google-cloud/common": "^2.2.2",
+        "@google-cloud/paginator": "^2.0.0",
+        "@google-cloud/projectify": "^1.0.0",
+        "@google-cloud/promisify": "^1.0.0",
+        "@opencensus/propagation-stackdriver": "0.0.20",
+        "arrify": "^2.0.0",
+        "dot-prop": "^5.1.0",
+        "eventid": "^1.0.0",
+        "extend": "^3.0.2",
+        "gcp-metadata": "^3.1.0",
+        "google-auth-library": "^5.2.2",
+        "google-gax": "^1.11.0",
+        "is": "^3.3.0",
+        "on-finished": "^2.3.0",
+        "pumpify": "^2.0.0",
+        "snakecase-keys": "^3.0.0",
+        "stream-events": "^1.0.4",
+        "through2": "^3.0.0",
+        "type-fest": "^0.12.0"
+      },
+      "dependencies": {
+        "google-auth-library": {
+          "version": "5.10.1",
+          "resolved": "https://registry.npmjs.org/google-auth-library/-/google-auth-library-5.10.1.tgz",
+          "integrity": "sha512-rOlaok5vlpV9rSiUu5EpR0vVpc+PhN62oF4RyX/6++DG1VsaulAFEMlDYBLjJDDPI6OcNOCGAKy9UVB/3NIDXg==",
+          "requires": {
+            "arrify": "^2.0.0",
+            "base64-js": "^1.3.0",
+            "ecdsa-sig-formatter": "^1.0.11",
+            "fast-text-encoding": "^1.0.0",
+            "gaxios": "^2.1.0",
+            "gcp-metadata": "^3.4.0",
+            "gtoken": "^4.1.0",
+            "jws": "^4.0.0",
+            "lru-cache": "^5.0.0"
+          }
+        }
+      }
+    },
+    "@google-cloud/logging-bunyan": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/@google-cloud/logging-bunyan/-/logging-bunyan-3.0.0.tgz",
+      "integrity": "sha512-ZLVXEejNQ27ktGcA3S/sd7GPefp7kywbn+/KoBajdb1Syqcmtc98jhXpYQBXVtNP2065iyu77s4SBaiYFbTC5A==",
+      "requires": {
+        "@google-cloud/logging": "^7.0.0",
+        "google-auth-library": "^6.0.0"
+      }
+    },
+    "@google-cloud/paginator": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/@google-cloud/paginator/-/paginator-2.0.3.tgz",
+      "integrity": "sha512-kp/pkb2p/p0d8/SKUu4mOq8+HGwF8NPzHWkj+VKrIPQPyMRw8deZtrO/OcSiy9C/7bpfU5Txah5ltUNfPkgEXg==",
+      "requires": {
+        "arrify": "^2.0.0",
+        "extend": "^3.0.2"
+      }
+    },
+    "@google-cloud/projectify": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/@google-cloud/projectify/-/projectify-1.0.4.tgz",
+      "integrity": "sha512-ZdzQUN02eRsmTKfBj9FDL0KNDIFNjBn/d6tHQmA/+FImH5DO6ZV8E7FzxMgAUiVAUq41RFAkb25p1oHOZ8psfg=="
+    },
+    "@google-cloud/promisify": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/@google-cloud/promisify/-/promisify-1.0.4.tgz",
+      "integrity": "sha512-VccZDcOql77obTnFh0TbNED/6ZbbmHDf8UMNnzO1d5g9V0Htfm4k5cllY8P1tJsRKC3zWYGRLaViiupcgVjBoQ=="
+    },
+    "@grpc/grpc-js": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/@grpc/grpc-js/-/grpc-js-1.0.5.tgz",
+      "integrity": "sha512-Hm+xOiqAhcpT9RYM8lc15dbQD7aQurM7ZU8ulmulepiPlN7iwBXXwP3vSBUimoFoApRqz7pSIisXU8pZaCB4og==",
+      "requires": {
+        "semver": "^6.2.0"
+      }
+    },
+    "@grpc/proto-loader": {
+      "version": "0.5.4",
+      "resolved": "https://registry.npmjs.org/@grpc/proto-loader/-/proto-loader-0.5.4.tgz",
+      "integrity": "sha512-HTM4QpI9B2XFkPz7pjwMyMgZchJ93TVkL3kWPW8GDMDKYxsMnmf4w2TNMJK7+KNiYHS5cJrCEAFlF+AwtXWVPA==",
+      "requires": {
+        "lodash.camelcase": "^4.3.0",
+        "protobufjs": "^6.8.6"
+      }
+    },
+    "@opencensus/core": {
+      "version": "0.0.20",
+      "resolved": "https://registry.npmjs.org/@opencensus/core/-/core-0.0.20.tgz",
+      "integrity": "sha512-vqOuTd2yuMpKohp8TNNGUAPjWEGjlnGfB9Rh5e3DKqeyR94YgierNs4LbMqxKtsnwB8Dm2yoEtRuUgoe5vD9DA==",
+      "requires": {
+        "continuation-local-storage": "^3.2.1",
+        "log-driver": "^1.2.7",
+        "semver": "^6.0.0",
+        "shimmer": "^1.2.0",
+        "uuid": "^3.2.1"
+      },
+      "dependencies": {
+        "uuid": {
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+}
diff --git a/libraries/logger/package.json b/libraries/logger/package.json
new file mode 100644
index 0000000000..f429928eb6
--- /dev/null
+++ b/libraries/logger/package.json
@@ -0,0 +1,44 @@
+{
+  "name": "logger-sharelatex",
+  "homepage": "www.sharelatex.com",
+  "description": "A centralised logging system for ShareLaTeX",
+  "repository": {
+    "type": "git",
+    "url": "http://github.com/sharelatex/logger-sharelatex.git"
+  },
+  "license": "AGPL-3.0-only",
+  "version": "2.2.0",
+  "scripts": {
+    "test": "mocha --grep=$MOCHA_GREP test/**/*.js",
+    "format": "prettier-eslint $PWD'/**/*.js' --list-different",
+    "format:fix": "prettier-eslint $PWD'/**/*.js' --write",
+    "lint": "eslint -f unix ."
+  },
+  "dependencies": {
+    "@google-cloud/logging-bunyan": "^3.0.0",
+    "@overleaf/o-error": "^3.0.0",
+    "bunyan": "^1.8.14",
+    "node-fetch": "^2.6.0",
+    "raven": "^2.6.4",
+    "yn": "^4.0.0"
+  },
+  "devDependencies": {
+    "chai": "^4.2.0",
+    "eslint": "^7.3.1",
+    "eslint-config-prettier": "^6.11.0",
+    "eslint-config-standard": "^14.1.1",
+    "eslint-plugin-chai-expect": "^2.1.0",
+    "eslint-plugin-chai-friendly": "^0.6.0",
+    "eslint-plugin-import": "^2.22.0",
+    "eslint-plugin-mocha": "^7.0.1",
+    "eslint-plugin-node": "^11.1.0",
+    "eslint-plugin-promise": "^4.2.1",
+    "eslint-plugin-standard": "^4.0.1",
+    "mocha": "^8.0.1",
+    "prettier": "^2.0.5",
+    "prettier-eslint-cli": "^5.0.0",
+    "sandboxed-module": "^2.0.4",
+    "sinon": "^9.0.2",
+    "sinon-chai": "^3.5.0"
+  }
+}
diff --git a/libraries/logger/test/unit/loggingManagerTests.js b/libraries/logger/test/unit/loggingManagerTests.js
new file mode 100644
index 0000000000..93c57bd807
--- /dev/null
+++ b/libraries/logger/test/unit/loggingManagerTests.js
@@ -0,0 +1,569 @@
+const SandboxedModule = require('sandboxed-module')
+const bunyan = require('bunyan')
+const chai = require('chai')
+const path = require('path')
+const sinon = require('sinon')
+const sinonChai = require('sinon-chai')
+
+chai.use(sinonChai)
+chai.should()
+const expect = chai.expect
+
+const modulePath = path.join(__dirname, '../../logging-manager.js')
+
+describe('LoggingManager', function () {
+  beforeEach(function () {
+    this.start = Date.now()
+    this.clock = sinon.useFakeTimers(this.start)
+    this.captureException = sinon.stub()
+    this.bunyanLogger = {
+      addStream: sinon.stub(),
+      debug: sinon.stub(),
+      error: sinon.stub(),
+      fatal: sinon.stub(),
+      info: sinon.stub(),
+      level: sinon.stub(),
+      warn: sinon.stub()
+    }
+    this.ravenClient = {
+      captureException: this.captureException,
+      once: sinon.stub().yields()
+    }
+    this.fetchResponse = {
+      text: sinon.stub().resolves(''),
+      status: 200,
+      ok: true
+    }
+    this.Bunyan = {
+      createLogger: sinon.stub().returns(this.bunyanLogger),
+      RingBuffer: bunyan.RingBuffer,
+      stdSerializers: {
+        req: sinon.stub(),
+        res: sinon.stub()
+      }
+    }
+    this.Raven = {
+      Client: sinon.stub().returns(this.ravenClient)
+    }
+    this.Fetch = sinon.stub().resolves(this.fetchResponse)
+    this.Fs = {
+      readFile: sinon.stub(),
+      promises: {
+        readFile: sinon.stub()
+      }
+    }
+    this.stackdriverStreamConfig = { stream: 'stackdriver' }
+    this.stackdriverClient = {
+      stream: sinon.stub().returns(this.stackdriverStreamConfig)
+    }
+    this.GCPLogging = {
+      LoggingBunyan: sinon.stub().returns(this.stackdriverClient)
+    }
+    this.LoggingManager = SandboxedModule.require(modulePath, {
+      globals: { console, process },
+      requires: {
+        bunyan: this.Bunyan,
+        raven: this.Raven,
+        'node-fetch': this.Fetch,
+        fs: this.Fs,
+        '@google-cloud/logging-bunyan': this.GCPLogging
+      }
+    })
+    this.loggerName = 'test'
+    this.logger = this.LoggingManager.initialize(this.loggerName)
+    this.logger.initializeErrorReporting('test_dsn')
+  })
+
+  afterEach(function () {
+    this.clock.restore()
+  })
+
+  describe('initialize', function () {
+    beforeEach(function () {
+      this.checkLogLevelStub = sinon
+        .stub(this.LoggingManager, 'checkLogLevel')
+        .resolves('')
+      this.Bunyan.createLogger.reset()
+    })
+
+    afterEach(function () {
+      this.checkLogLevelStub.restore()
+    })
+
+    describe('not in production', function () {
+      beforeEach(function () {
+        this.logger = this.LoggingManager.initialize(this.loggerName)
+      })
+
+      it('should default to log level debug', function () {
+        this.Bunyan.createLogger.firstCall.args[0].streams[0].level.should.equal(
+          'debug'
+        )
+      })
+
+      it('should not run checkLogLevel', function () {
+        this.checkLogLevelStub.should.not.have.been.called
+      })
+    })
+
+    describe('in production', function () {
+      beforeEach(function () {
+        process.env.NODE_ENV = 'production'
+        this.logger = this.LoggingManager.initialize(this.loggerName)
+      })
+
+      afterEach(() => delete process.env.NODE_ENV)
+
+      it('should default to log level warn', function () {
+        this.Bunyan.createLogger.firstCall.args[0].streams[0].level.should.equal(
+          'warn'
+        )
+      })
+
+      describe('logLevelSource file', function () {
+        it('should run checkLogLevel', function () {
+          this.checkLogLevelStub.should.have.been.calledOnce
+        })
+
+        describe('after 1 minute', () =>
+          it('should run checkLogLevel again', function () {
+            this.clock.tick(61 * 1000)
+            this.checkLogLevelStub.should.have.been.calledTwice
+          }))
+
+        describe('after 2 minutes', () =>
+          it('should run checkLogLevel again', function () {
+            this.clock.tick(121 * 1000)
+            this.checkLogLevelStub.should.have.been.calledThrice
+          }))
+      })
+    })
+
+    describe('when LOG_LEVEL set in env', function () {
+      beforeEach(function () {
+        process.env.LOG_LEVEL = 'trace'
+        this.LoggingManager.initialize()
+      })
+
+      afterEach(() => delete process.env.LOG_LEVEL)
+
+      it('should use custom log level', function () {
+        this.Bunyan.createLogger.firstCall.args[0].streams[0].level.should.equal(
+          'trace'
+        )
+      })
+    })
+  })
+
+  describe('bunyan logging', function () {
+    beforeEach(function () {
+      this.logArgs = [{ foo: 'bar' }, 'foo', 'bar']
+    })
+
+    it('should log debug', function () {
+      this.logger.debug(this.logArgs)
+      this.bunyanLogger.debug.should.have.been.calledWith(this.logArgs)
+    })
+
+    it('should log error', function () {
+      this.logger.error(this.logArgs)
+      this.bunyanLogger.error.should.have.been.calledWith(this.logArgs)
+    })
+
+    it('should log fatal', function () {
+      this.logger.fatal(this.logArgs)
+      this.bunyanLogger.fatal.should.have.been.calledWith(this.logArgs)
+    })
+
+    it('should log info', function () {
+      this.logger.info(this.logArgs)
+      this.bunyanLogger.info.should.have.been.calledWith(this.logArgs)
+    })
+
+    it('should log warn', function () {
+      this.logger.warn(this.logArgs)
+      this.bunyanLogger.warn.should.have.been.calledWith(this.logArgs)
+    })
+
+    it('should log err', function () {
+      this.logger.err(this.logArgs)
+      this.bunyanLogger.error.should.have.been.calledWith(this.logArgs)
+    })
+
+    it('should log log', function () {
+      this.logger.log(this.logArgs)
+      this.bunyanLogger.info.should.have.been.calledWith(this.logArgs)
+    })
+  })
+
+  describe('logger.error', function () {
+    it('should report a single error to sentry', function () {
+      this.logger.error({ foo: 'bar' }, 'message')
+      this.captureException.called.should.equal(true)
+    })
+
+    it('should report the same error to sentry only once', function () {
+      const error1 = new Error('this is the error')
+      this.logger.error({ foo: error1 }, 'first message')
+      this.logger.error({ bar: error1 }, 'second message')
+      this.captureException.callCount.should.equal(1)
+    })
+
+    it('should report two different errors to sentry individually', function () {
+      const error1 = new Error('this is the error')
+      const error2 = new Error('this is the error')
+      this.logger.error({ foo: error1 }, 'first message')
+      this.logger.error({ bar: error2 }, 'second message')
+      this.captureException.callCount.should.equal(2)
+    })
+
+    it('should remove the path from fs errors', function () {
+      const fsError = new Error(
+        "Error: ENOENT: no such file or directory, stat '/tmp/3279b8d0-da10-11e8-8255-efd98985942b'"
+      )
+      fsError.path = '/tmp/3279b8d0-da10-11e8-8255-efd98985942b'
+      this.logger.error({ err: fsError }, 'message')
+      this.captureException
+        .calledWith(
+          sinon.match.has(
+            'message',
+            'Error: ENOENT: no such file or directory, stat'
+          )
+        )
+        .should.equal(true)
+    })
+
+    it('for multiple errors should only report a maximum of 5 errors to sentry', function () {
+      this.logger.error({ foo: 'bar' }, 'message')
+      this.logger.error({ foo: 'bar' }, 'message')
+      this.logger.error({ foo: 'bar' }, 'message')
+      this.logger.error({ foo: 'bar' }, 'message')
+      this.logger.error({ foo: 'bar' }, 'message')
+      this.logger.error({ foo: 'bar' }, 'message')
+      this.logger.error({ foo: 'bar' }, 'message')
+      this.logger.error({ foo: 'bar' }, 'message')
+      this.logger.error({ foo: 'bar' }, 'message')
+      this.captureException.callCount.should.equal(5)
+    })
+
+    it('for multiple errors with a minute delay should report 10 errors to sentry', function () {
+      // the first five errors should be reported to sentry
+      this.logger.error({ foo: 'bar' }, 'message')
+      this.logger.error({ foo: 'bar' }, 'message')
+      this.logger.error({ foo: 'bar' }, 'message')
+      this.logger.error({ foo: 'bar' }, 'message')
+      this.logger.error({ foo: 'bar' }, 'message')
+      // the following errors should not be reported
+      this.logger.error({ foo: 'bar' }, 'message')
+      this.logger.error({ foo: 'bar' }, 'message')
+      this.logger.error({ foo: 'bar' }, 'message')
+      this.logger.error({ foo: 'bar' }, 'message')
+      // allow a minute to pass
+      this.clock.tick(this.start + 61 * 1000)
+      // after a minute the next five errors should be reported to sentry
+      this.logger.error({ foo: 'bar' }, 'message')
+      this.logger.error({ foo: 'bar' }, 'message')
+      this.logger.error({ foo: 'bar' }, 'message')
+      this.logger.error({ foo: 'bar' }, 'message')
+      this.logger.error({ foo: 'bar' }, 'message')
+      // the following errors should not be reported to sentry
+      this.logger.error({ foo: 'bar' }, 'message')
+      this.logger.error({ foo: 'bar' }, 'message')
+      this.logger.error({ foo: 'bar' }, 'message')
+      this.logger.error({ foo: 'bar' }, 'message')
+      this.captureException.callCount.should.equal(10)
+    })
+
+    describe('reportedToSentry', function () {
+      it('should mark the error as reported to sentry', function () {
+        const err = new Error()
+        this.logger.error({ err }, 'message')
+        expect(this.captureException.called).to.equal(true)
+        expect(err.reportedToSentry).to.equal(true)
+      })
+
+      it('should mark two errors as reported to sentry', function () {
+        const err1 = new Error()
+        const err2 = new Error()
+        this.logger.error({ err: err1, err2 }, 'message')
+        expect(this.captureException.called).to.equal(true)
+        expect(err1.reportedToSentry).to.equal(true)
+        expect(err2.reportedToSentry).to.equal(true)
+      })
+
+      it('should not mark arbitrary objects as reported to sentry', function () {
+        const err = new Error()
+        const ctx = { foo: 'bar' }
+        this.logger.error({ err, ctx }, 'message')
+        expect(this.captureException.called).to.equal(true)
+        expect(ctx.reportedToSentry).to.equal(undefined)
+      })
+    })
+  })
+
+  describe('checkLogLevelFile', function () {
+    it('should request log level override from the config map', async function () {
+      this.logger.getTracingEndTime = this.logger.getTracingEndTimeFile
+      await this.logger.checkLogLevel()
+      this.Fs.promises.readFile.should.have.been.calledWithMatch(
+        '/logging/tracingEndTime'
+      )
+    })
+
+    describe('when read errors', function () {
+      beforeEach(async function () {
+        this.Fs.promises.readFile.throws(new Error('test read error'))
+        this.logger.getTracingEndTime = this.logger.getTracingEndTimeFile
+        await this.logger.checkLogLevel()
+      })
+
+      it('should only set default level', function () {
+        this.bunyanLogger.level.should.have.been.calledOnce.and.calledWith(
+          'debug'
+        )
+      })
+    })
+
+    describe('when the file is empty', function () {
+      beforeEach(async function () {
+        this.Fs.promises.readFile.returns('')
+        this.logger.getTracingEndTime = this.logger.getTracingEndTimeFile
+        await this.logger.checkLogLevel()
+      })
+
+      it('should only set default level', function () {
+        this.bunyanLogger.level.should.have.been.calledOnce.and.calledWith(
+          'debug'
+        )
+      })
+    })
+
+    describe('when time value returned that is less than current time', function () {
+      beforeEach(async function () {
+        this.Fs.promises.readFile.returns('1')
+        this.logger.getTracingEndTime = this.logger.getTracingEndTimeFile
+        await this.logger.checkLogLevel()
+      })
+
+      it('should only set default level', function () {
+        this.bunyanLogger.level.should.have.been.calledOnce.and.calledWith(
+          'debug'
+        )
+      })
+    })
+
+    describe('when time value returned that is more than current time', function () {
+      describe('when level is already set', function () {
+        beforeEach(async function () {
+          this.bunyanLogger.level.returns(10)
+          this.Fs.promises.readFile.returns((this.start + 1000).toString())
+          this.logger.getTracingEndTime = this.logger.getTracingEndTimeFile
+          await this.logger.checkLogLevel()
+        })
+
+        it('should set trace level', function () {
+          this.bunyanLogger.level.should.have.been.calledOnce.and.calledWith(
+            'trace'
+          )
+        })
+      })
+
+      describe('when level is not already set', function () {
+        beforeEach(async function () {
+          this.bunyanLogger.level.returns(20)
+          this.Fs.promises.readFile.returns((this.start + 1000).toString())
+          this.logger.getTracingEndTime = this.logger.getTracingEndTimeFile
+          await this.logger.checkLogLevel()
+        })
+
+        it('should set trace level', function () {
+          this.bunyanLogger.level.should.have.been.calledOnce.and.calledWith(
+            'trace'
+          )
+        })
+      })
+    })
+  })
+
+  describe('checkLogLevelMetadata', function () {
+    beforeEach(function () {
+      this.logger = this.LoggingManager.initialize(this.loggerName)
+    })
+
+    describe('checkLogLevel', function () {
+      it('should request log level override from google meta data service', async function () {
+        this.logger.getTracingEndTime = this.logger.getTracingEndTimeMetadata
+        await this.logger.checkLogLevel()
+        const options = {
+          headers: {
+            'Metadata-Flavor': 'Google'
+          }
+        }
+        const uri = `http://metadata.google.internal/computeMetadata/v1/project/attributes/${this.loggerName}-setLogLevelEndTime`
+        this.Fetch.should.have.been.calledWithMatch(uri, options)
+      })
+
+      describe('when request has error', function () {
+        beforeEach(async function () {
+          this.Fetch = sinon.stub().throws()
+          this.logger.getTracingEndTime = this.logger.getTracingEndTimeMetadata
+          await this.logger.checkLogLevel()
+        })
+
+        it('should only set default level', function () {
+          this.bunyanLogger.level.should.have.been.calledOnce.and.calledWith(
+            'debug'
+          )
+        })
+      })
+
+      describe('when statusCode is not 200', function () {
+        beforeEach(async function () {
+          this.fetchResponse.status = 404
+          this.logger.getTracingEndTime = this.logger.getTracingEndTimeMetadata
+          await this.logger.checkLogLevel()
+        })
+
+        it('should only set default level', function () {
+          this.bunyanLogger.level.should.have.been.calledOnce.and.calledWith(
+            'debug'
+          )
+        })
+      })
+
+      describe('when time value returned that is less than current time', function () {
+        beforeEach(async function () {
+          this.logger.getTracingEndTime = this.logger.getTracingEndTimeMetadata
+          this.fetchResponse.text = sinon.stub().resolves('1')
+          await this.logger.checkLogLevel()
+        })
+
+        it('should only set default level', function () {
+          this.bunyanLogger.level.should.have.been.calledOnce.and.calledWith(
+            'debug'
+          )
+        })
+      })
+
+      describe('when time value returned that is more than current time', function () {
+        describe('when level is already set', function () {
+          beforeEach(async function () {
+            this.bunyanLogger.level.returns(10)
+            this.fetchResponse.text = sinon
+              .stub()
+              .resolves((this.start + 1000).toString())
+            this.logger.getTracingEndTime = this.logger.getTracingEndTimeMetadata
+
+            await this.logger.checkLogLevel()
+          })
+
+          it('should set trace level', function () {
+            this.bunyanLogger.level.should.have.been.calledOnce.and.calledWith(
+              'trace'
+            )
+          })
+        })
+
+        describe('when level is not already set', function () {
+          beforeEach(async function () {
+            this.bunyanLogger.level.returns(20)
+            this.fetchResponse.text = sinon
+              .stub()
+              .resolves((this.start + 1000).toString())
+            this.Fetch.fetch = sinon.stub().resolves(this.fetchResponse)
+            this.logger.getTracingEndTime = this.logger.getTracingEndTimeMetadata
+
+            await this.logger.checkLogLevel()
+          })
+
+          it('should set trace level', function () {
+            this.bunyanLogger.level.should.have.been.calledOnce.and.calledWith(
+              'trace'
+            )
+          })
+        })
+      })
+    })
+  })
+
+  describe('ringbuffer', function () {
+    beforeEach(function () {
+      this.logBufferMock = [
+        { msg: 'log 1' },
+        { msg: 'log 2' },
+        { level: 50, msg: 'error' }
+      ]
+    })
+
+    describe('when ring buffer size is positive', function () {
+      beforeEach(function () {
+        process.env.LOG_RING_BUFFER_SIZE = '20'
+        this.logger = this.LoggingManager.initialize(this.loggerName)
+        this.logger.ringBuffer.records = this.logBufferMock
+        this.logger.error({}, 'error')
+      })
+
+      afterEach(function () {
+        process.env.LOG_RING_BUFFER_SIZE = undefined
+      })
+
+      it('should include buffered logs in error log and filter out error logs in buffer', function () {
+        this.bunyanLogger.error.lastCall.args[0].logBuffer.should.deep.equal([
+          { msg: 'log 1' },
+          { msg: 'log 2' }
+        ])
+      })
+    })
+
+    describe('when ring buffer size is zero', function () {
+      beforeEach(function () {
+        process.env.LOG_RING_BUFFER_SIZE = '0'
+        this.logger = this.LoggingManager.initialize(this.loggerName)
+        this.logger.error({}, 'error')
+      })
+
+      afterEach(function () {
+        process.env.LOG_RING_BUFFER_SIZE = undefined
+      })
+
+      it('should not include buffered logs in error log', function () {
+        expect(this.bunyanLogger.error.lastCall.args[0].logBuffer).be.undefined
+      })
+    })
+  })
+
+  describe('stackdriver logging', function () {
+    describe('when STACKDRIVER_LOGGING is unset', function () {
+      beforeEach(function () {
+        process.env.STACKDRIVER_LOGGING = undefined
+        this.LoggingManager.initialize(this.loggerName)
+      })
+
+      it('is disabled', function () {
+        expect(this.bunyanLogger.addStream).not.to.have.been.calledWith(
+          this.stackdriverStreamConfig
+        )
+      })
+    })
+
+    describe('when STACKDRIVER_LOGGING is true', function () {
+      beforeEach(function () {
+        process.env.STACKDRIVER_LOGGING = 'true'
+        this.LoggingManager.initialize(this.loggerName)
+      })
+
+      it('is enabled', function () {
+        expect(this.bunyanLogger.addStream).to.have.been.calledWith(
+          this.stackdriverStreamConfig
+        )
+      })
+
+      it('is configured properly', function () {
+        expect(this.GCPLogging.LoggingBunyan).to.have.been.calledWith({
+          logName: this.loggerName,
+          serviceContext: { service: this.loggerName }
+        })
+      })
+    })
+  })
+})