upgrade v5.9.6: use goroutine when forward series
What's Changed
- fix: pg sql for recording rule by @tanxiao1990 in https://github.com/ccfos/nightingale/pull/1034
- fix: use goroutine forwarding series
- fix: add duplicate label key checker
Full Changelog: https://github.com/ccfos/nightingale/compare/v5.9.5...v5.9.6