服务监控系统 Prometheus 2.1.0 已发布，Prometheus 是一个 Go 语言开发的开源的服务监控系统和时间序列数据库。 
更新内容： [特性] New Service Discovery UI showing labels before and after relabelling. [特性] New Admin APIs added to v1 to delete, snapshot and remove tombstones. [改进] The graph UI autcomplete now includes your previous queries. [改进] Federation is now much faster for large numbers of series. [改进] Added new metrics to measure rule timings. [改进] Rule evaluation times added to the rules UI. [改进] Added metrics to measure modified time of file SD files. [改进] Kubernetes SD now includes POD UID in discovery metadata. [改进] The Query APIs now return optional stats on query execution times. [改进] The index now no longer has the 4GiB size limit and is also smaller. [修复] Remote read read_recent option is now false by default. [修复] Pass the right configuration to each Alertmanager (AM) when using multiple AM configs. [修复] Fix not-matchers not selecting series with labels unset. [修复] tsdb: Fix occasional panic in head block. [修复] tsdb: Close files before deletion to fix retention issues on Windows and NFS. [修复] tsdb: Cleanup and do not retry failing compactions. [修复] tsdb: Close WAL while shutting down.
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