Remove duplicated loki_boltdb_shipper prefix from tables_upload_operation_total metric

[bakunowski]

What this PR does / why we need it:
This PR removes the duplicated loki_boltdb_shipper prefix from the tables_upload_operation_total metric.

In #6278 metrics for tracking indexshipper operations were added. WrapRegistererWithPrefix was used to make sure the same metrics as before were exposed (see here).

While the downloads metrics had the Namespace field removed (see here), the uploads metric did not (see here). This results in the tables_upload_operation_total being exposed as loki_boltdb_shipper_loki_boltdb_shipper_tables_upload_operation_total instead of loki_boltdb_shipper_tables_upload_operation_total.

Which issue(s) this PR fixes:
This PR serves both as an issue and a fix.

Special notes for your reviewer:
This is my best interpretation why the exposed name of the uploads metric has changed. If this is incorrect, or the change was intentional - I'm sorry for the noise.

Checklist

• Documentation added
• Tests updated
• Is this an important fix or new feature? Add an entry in the CHANGELOG.md.
• Changes that require user attention or interaction to upgrade are documented in docs/sources/upgrading/_index.md

[CLAassistant]

All committers have signed the CLA.

[grafanabot]

./tools/diff_coverage.sh ../loki-main/test_results.txt test_results.txt ingester,distributor,querier,querier/queryrange,iter,storage,chunkenc,logql,loki

Change in test coverage per package. Green indicates 0 or positive change, red indicates that test coverage for a package fell.

+           ingester	0%
+        distributor	0%
+            querier	0%
+ querier/queryrange	0%
+               iter	0%
+            storage	0%
+           chunkenc	0%
+              logql	0%
+               loki	0%

[kavirajk]

LGTM. Thanks for the PR @bakunowski. Sounds totally reasonable. Also double checked with metrics coming from internal Loki clusters.

Since this is the user visible change, can you please add it in CHANGELOG as well please? I will merge after that.

[bakunowski]

Thanks for the review @kavirajk, glad to hear I wasn't completely off the mark. Updated CHANGELOG in the Fixes section.

[grafanabot]

./tools/diff_coverage.sh ../loki-main/test_results.txt test_results.txt ingester,distributor,querier,querier/queryrange,iter,storage,chunkenc,logql,loki

Change in test coverage per package. Green indicates 0 or positive change, red indicates that test coverage for a package fell.

+           ingester	0%
+        distributor	0%
+            querier	0%
+ querier/queryrange	0%
+               iter	0%
+            storage	0%
+           chunkenc	0%
+              logql	0%
+               loki	0%

[grafanabot]

./tools/diff_coverage.sh ../loki-main/test_results.txt test_results.txt ingester,distributor,querier,querier/queryrange,iter,storage,chunkenc,logql,loki

Change in test coverage per package. Green indicates 0 or positive change, red indicates that test coverage for a package fell.

+           ingester	0%
+        distributor	0%
+            querier	0%
+ querier/queryrange	0%
+               iter	0%
+            storage	0%
+           chunkenc	0%
+              logql	0%
+               loki	0%

[sandeepsukhani]

LGTM! Thanks for fixing it!