cmd/thanos/receive: dont upload as sidecar

As pointed out by a user on the CNCF Slack, the receiver is currently
uploading to object storage as the sidecar.

Signed-off-by: Lucas Servén Marín <lserven@gmail.com>

CHANGELOG.md

@@ -13,6 +13,7 @@ We use *breaking* word for marking changes that are not backward compatible (rel
 ### Fixed
 
 - [#1856](https://github.com/thanos-io/thanos/pull/1856) Receive: close DBReadOnly after flushing to fix a memory leak.
+- [#1882](https://github.com/thanos-io/thanos/pull/1882) Receive: upload to object storage as 'receive' rather than 'sidecar'.
 
 ### Added
 - [#1852](https://github.com/thanos-io/thanos/pull/1852) Add support for `AWS_CONTAINER_CREDENTIALS_FULL_URI` by upgrading to minio-go v6.0.44

cmd/thanos/receive.go

@@ -407,7 +407,7 @@ func runReceive(
 	if upload {
 		// The background shipper continuously scans the data directory and uploads
 		// new blocks to Google Cloud Storage or an S3-compatible storage service.
-		bkt, err := client.NewBucket(logger, confContentYaml, reg, component.Sidecar.String())
+		bkt, err := client.NewBucket(logger, confContentYaml, reg, component.Receive.String())
 		if err != nil {
 			return err
 		}