Prometheus version 0.9.0.

CHANGELOG.md

+## 0.9.0 / 2015-01-23
+* [CHANGE] Reworked command line flags, now more consistent and taking into
+  account needs of the new storage backend (see below).
+* [CHANGE] Metric names are dropped after certain transformations.
+* [CHANGE] Changed partitioning of summary metrics exported by Prometheus.
+* [CHANGE] Got rid of Gerrit as a review tool.
+* [CHANGE] 'Tabular' view now the default (rather than 'Graph') to avoid
+  running very expensive queries accidentally.
+* [CHANGE] On-disk format for stored samples changed. For upgrading, you have
+  to nuke your old files completely. See "Complete rewrite of the storage
+* [CHANGE] Removed 2nd argument from `delta`.
+* [FEATURE] Added a `deriv` function.
+* [FEATURE] Console templates.
+* [FEATURE] Added `absent` function.
+* [FEATURE] Allow omitting the metric name in queries.
+* [BUGFIX] Removed all known race conditions.
+* [BUGFIX] Metric mutations now handled correctly in all cases.
+* [ENHANCEMENT] Proper double-start protection.
+* [ENHANCEMENT] Complete rewrite of the storage layer. Benefits include:
+  * Better query performance.
+  * More samples in less RAM.
+  * Better memory management.
+  * Scales up to millions of time series and thousands of samples ingested
+    per second.
+  * Purging of obsolete samples much cleaner now, up to completely
+    "forgetting" obsolete time series.
+  * Proper instrumentation to diagnose the storage layer with... well...
+    Prometheus.
+  * Pure Go implementation, no need for cgo and shared C libraries anymore.
+  * Better concurrency.
+* [ENHANCEMENT] Copy-on-write semantics in the AST layer.
+* [ENHANCEMENT] Switched from Go 1.3 to Go 1.4.
+* [ENHANCEMENT] Vendored external dependencies with godeps.
+* [ENHANCEMENT] Numerous Web UI improvements, moved to Bootstrap3 and
+  Rickshaw 1.5.1.
+* [ENHANCEMENT] Improved Docker integration.
+* [ENHANCEMENT] Simplified the Makefile contraption.
+* [CLEANUP] Put meta-data files into proper shape (LICENSE, README.md etc.)
+* [CLEANUP] Removed all legitimate 'go vet' and 'golint' warnings.
+* [CLEANUP] Removed dead code.
+
 ## 0.8.0 / 2014-09-04
 * [ENHANCEMENT] Stagger scrapes to spread out load.
 * [BUGFIX] Correctly quote HTTP Accept header.

VERSION

-0.9.0rc5
+0.9.0