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Salva Corts 78aad0b805 Fix buffered iterator (#9976) ... **What this PR does / why we need it**: In https://github.com/grafana/loki/pull/9700, we added support for writing non-indexed labels from entries into chunks. This PR introduced two bugs: - When the buffered iterator is closed, the buffer to read metadata labels is put back into the pool but not set to nil. Subsequent uses of the iterator may write on top of the buffer that was put back on the pool. This may lead to inconsistent/incorrect results. - Inside the buffered iterator, we were not correctly handling EOFs while reading the number of labels and each label length. This was due to the `lastAttemp` variable not being reset. This PR adds a new test for these two bugs and also fixes them. **Which issue(s) this PR fixes**: Fixes https://github.com/grafana/loki/pull/9700 **Special notes for your reviewer**: **Checklist** - [ ] Reviewed the [`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md) guide (**required**) - [ ] Documentation added - [ ] Tests updated - [ ] `CHANGELOG.md` updated - [ ] If the change is worth mentioning in the release notes, add `add-to-release-notes` label - [ ] Changes that require user attention or interaction to upgrade are documented in `docs/sources/upgrading/_index.md` - [ ] For Helm chart changes bump the Helm chart version in `production/helm/loki/Chart.yaml` and update `production/helm/loki/CHANGELOG.md` and `production/helm/loki/README.md`. [Example PR](d10549e3ec)		2 years ago
..
analytics	Upgrade `golangci-lint` and fix linting errors (#9601)	2 years ago
canary	Upgrade `golangci-lint` and fix linting errors (#9601)	2 years ago
chunkenc	Fix buffered iterator (#9976)	2 years ago
configs	Update prometheus/prometheus from 2.41 to 2.42 (#8571)	2 years ago
distributor	Revert "updated to the latest version of dskit" (#9953)	2 years ago
ingester	Add non-indexed metadata to chunks (#9700)	2 years ago
iter	Reuse allocated buffer space in merge iterator. (#9538)	2 years ago
logcli	Upgrade `golangci-lint` and fix linting errors (#9601)	2 years ago
loghttp	Include entry metadata bytes in metrics tracking ingestion stats (#9808)	2 years ago
logproto	Define protobufs for topk and cms. (#9933)	2 years ago
logql	reset pipeline caches when tailing rather than making a new pipeline (#9949)	2 years ago
logqlanalyzer	fixed logql-analyzer (#8258)	2 years ago
logqlmodel	Define protobufs for topk and cms. (#9933)	2 years ago
loki	Revert "updated to the latest version of dskit" (#9953)	2 years ago
lokifrontend	Upgrade `golangci-lint` and fix linting errors (#9601)	2 years ago
push	Remove Prometheus dependency for push pkg (#9937)	2 years ago
querier	Revert "updated to the latest version of dskit" (#9953)	2 years ago
ruler	Loki: Fix a merge error when getting rules from sharded rulers using the `/prometheus/api/v1/rules` endpoint (#9973)	2 years ago
runtime	Loki: Implement initial phase of `limited_log_push_errors` (#9556)	2 years ago
scheduler	Revert "updated to the latest version of dskit" (#9953)	2 years ago
server	Configurable TLS MinVersion and CipherSuites (#7227)	3 years ago
sizing	Upgrade `golangci-lint` and fix linting errors (#9601)	2 years ago
storage	Add non-indexed metadata to chunks (#9700)	2 years ago
tracing	Promtail: Add basic tracing support (#7414)	3 years ago
util	Remove Prometheus dependency for push pkg (#9937)	2 years ago
validation	Add limit to the series volume endpoint (#9833)	2 years ago