--- services/history-v1/api/controllers/projects.js
+++ services/history-v1/api/controllers/projects.js
@@ -194,18 +194,23 @@ async function getProjectBlob(req, res, next) {
   const hash = req.swagger.params.hash.value

   const blobStore = new BlobStore(projectId)
-  let stream
+  logger.debug({ projectId, hash }, 'getProjectBlob started')
   try {
-    stream = await blobStore.getStream(hash)
-  } catch (err) {
-    if (err instanceof Blob.NotFoundError) {
-      return render.notFound(res)
-    } else {
-      throw err
+    let stream
+    try {
+      stream = await blobStore.getStream(hash)
+    } catch (err) {
+      if (err instanceof Blob.NotFoundError) {
+        return render.notFound(res)
+      } else {
+        throw err
+      }
     }
+    res.set('Content-Type', 'application/octet-stream')
+    await pipeline(stream, res)
+  } finally {
+    logger.debug({ projectId, hash }, 'getProjectBlob finished')
   }
-  res.set('Content-Type', 'application/octet-stream')
-  await pipeline(stream, res)
 }

 async function getSnapshotAtVersion(projectId, version) {
--- services/history-v1/storage/lib/blob_store/index.js
+++ services/history-v1/storage/lib/blob_store/index.js
@@ -20,6 +20,7 @@ const projectKey = require('../project_key')
 const streams = require('../streams')
 const postgresBackend = require('./postgres')
 const mongoBackend = require('./mongo')
+const logger = require('@overleaf/logger')

 const GLOBAL_BLOBS = new Map()

@@ -34,9 +35,14 @@ function makeProjectKey(projectId, hash) {
 async function uploadBlob(projectId, blob, stream) {
   const bucket = config.get('blobStore.projectBucket')
   const key = makeProjectKey(projectId, blob.getHash())
-  await persistor.sendStream(bucket, key, stream, {
-    contentType: 'application/octet-stream',
-  })
+  logger.debug({ projectId, blob }, 'uploadBlob started')
+  try {
+    await persistor.sendStream(bucket, key, stream, {
+      contentType: 'application/octet-stream',
+    })
+  } finally {
+    logger.debug({ projectId, blob }, 'uploadBlob finished')
+  }
 }

 function getBlobLocation(projectId, hash) {
@@ -109,7 +115,12 @@ async function getStringLengthOfFile(byteLength, pathname) {
 async function deleteBlobsInBucket(projectId) {
   const bucket = config.get('blobStore.projectBucket')
   const prefix = `${projectKey.format(projectId)}/`
-  await persistor.deleteDirectory(bucket, prefix)
+  logger.debug({ projectId }, 'deleteBlobsInBucket started')
+  try {
+    await persistor.deleteDirectory(bucket, prefix)
+  } finally {
+    logger.debug({ projectId }, 'deleteBlobsInBucket finished')
+  }
 }

 async function loadGlobalBlobs() {
@@ -202,9 +213,15 @@ class BlobStore {
   async getString(hash) {
     assert.blobHash(hash, 'bad hash')

-    const stream = await this.getStream(hash)
-    const buffer = await streams.readStreamToBuffer(stream)
-    return buffer.toString()
+    const projectId = this.projectId
+    logger.debug({ projectId, hash }, 'getString started')
+    try {
+      const stream = await this.getStream(hash)
+      const buffer = await streams.readStreamToBuffer(stream)
+      return buffer.toString()
+    } finally {
+      logger.debug({ projectId, hash }, 'getString finished')
+    }
   }

   /**
--- services/history-v1/storage/lib/history_store.js
+++ services/history-v1/storage/lib/history_store.js
@@ -8,6 +8,7 @@ const path = require('path')

 const OError = require('@overleaf/o-error')
 const objectPersistor = require('@overleaf/object-persistor')
+const logger = require('@overleaf/logger')

 const assert = require('./assert')
 const persistor = require('./persistor')
@@ -70,6 +71,7 @@ HistoryStore.prototype.loadRaw = function historyStoreLoadRaw(

   const key = getKey(projectId, chunkId)

+  logger.debug({ projectId, chunkId }, 'loadRaw started')
   return BPromise.resolve()
     .then(() => persistor.getObjectStream(BUCKET, key))
     .then(streams.gunzipStreamToBuffer)
@@ -80,6 +82,7 @@ HistoryStore.prototype.loadRaw = function historyStoreLoadRaw(
       }
       throw new HistoryStore.LoadError(projectId, chunkId).withCause(err)
     })
+    .finally(() => logger.debug({ projectId, chunkId }, 'loadRaw finished'))
 }

 /**
@@ -102,6 +105,7 @@ HistoryStore.prototype.storeRaw = function historyStoreStoreRaw(
   const key = getKey(projectId, chunkId)
   const stream = streams.gzipStringToStream(JSON.stringify(rawHistory))

+  logger.debug({ projectId, chunkId }, 'storeRaw started')
   return BPromise.resolve()
     .then(() =>
       persistor.sendStream(BUCKET, key, stream, {
@@ -112,6 +116,7 @@ HistoryStore.prototype.storeRaw = function historyStoreStoreRaw(
     .catch(err => {
       throw new HistoryStore.StoreError(projectId, chunkId).withCause(err)
     })
+    .finally(() => logger.debug({ projectId, chunkId }, 'storeRaw finished'))
 }

 /**
@@ -121,12 +126,13 @@ HistoryStore.prototype.storeRaw = function historyStoreStoreRaw(
  * @return {Promise}
  */
 HistoryStore.prototype.deleteChunks = function historyDeleteChunks(chunks) {
+  logger.debug({ chunks }, 'deleteChunks started')
   return BPromise.all(
     chunks.map(chunk => {
       const key = getKey(chunk.projectId, chunk.chunkId)
       return persistor.deleteObject(BUCKET, key)
     })
-  )
+  ).finally(() => logger.debug({ chunks }, 'deleteChunks finished'))
 }

 module.exports = new HistoryStore()