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## 0.11.0 / 2015-02-23
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* [FEATURE] Introduce new metric type Histogram with server-side aggregation.
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* [FEATURE] Add offset operator.
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* [FEATURE] Add floor, ceil and round functions.
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* [CHANGE] Change instance identifiers to be host:port.
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* [CHANGE] Dependency management and vendoring changed/improved.
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* [CHANGE] Flag name changes to create consistency between various Prometheus
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binaries.
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* [CHANGE] Show unlimited number of metrics in autocomplete.
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* [CHANGE] Add query timeout.
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* [CHANGE] Remove labels on persist error counter.
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* [ENHANCEMENT] Various performance improvements for sample ingestion.
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* [ENHANCEMENT] Various Makefile improvements.
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* [ENHANCEMENT] Various console template improvements, including
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proof-of-concept for federation via console templates.
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* [ENHANCEMENT] Fix graph JS glitches and simplify graphing code.
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* [ENHANCEMENT] Dramatically decrease resources for file embedding.
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* [ENHANCEMENT] Crash recovery saves lost series data in 'orphaned' directory.
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* [BUGFIX] Fix aggregation grouping key calculation.
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* [BUGFIX] Fix Go download path for various architectures.
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* [BUGFIX] Fixed the link of the Travis build status image.
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* [BUGFIX] Fix Rickshaw/D3 version mismatch.
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* [CLEANUP] Various code cleanups.
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## 0.10.0 / 2015-01-26
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* [CHANGE] More efficient JSON result format in query API. This requires
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up-to-date versions of PromDash and prometheus_cli, too.
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* [ENHANCEMENT] Excluded non-minified Bootstrap assets and the Bootstrap maps
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from embedding into the binary. Those files are only used for debugging,
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and then you can use -web.use-local-assets. By including fewer files, the
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RAM usage during compilation is much more manageable.
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* [ENHANCEMENT] Help link points to http://prometheus.github.io now.
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* [FEATURE] Consoles for haproxy and cloudwatch.
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* [BUGFIX] Several fixes to graphs in consoles.
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* [CLEANUP] Removed a file size check that did not check anything.
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## 0.9.0 / 2015-01-23
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* [CHANGE] Reworked command line flags, now more consistent and taking into
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account needs of the new storage backend (see below).
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* [CHANGE] Metric names are dropped after certain transformations.
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* [CHANGE] Changed partitioning of summary metrics exported by Prometheus.
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* [CHANGE] Got rid of Gerrit as a review tool.
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* [CHANGE] 'Tabular' view now the default (rather than 'Graph') to avoid
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running very expensive queries accidentally.
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* [CHANGE] On-disk format for stored samples changed. For upgrading, you have
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to nuke your old files completely. See "Complete rewrite of the storage
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* [CHANGE] Removed 2nd argument from `delta`.
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* [FEATURE] Added a `deriv` function.
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* [FEATURE] Console templates.
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* [FEATURE] Added `absent` function.
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* [FEATURE] Allow omitting the metric name in queries.
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* [BUGFIX] Removed all known race conditions.
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* [BUGFIX] Metric mutations now handled correctly in all cases.
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* [ENHANCEMENT] Proper double-start protection.
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* [ENHANCEMENT] Complete rewrite of the storage layer. Benefits include:
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* Better query performance.
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* More samples in less RAM.
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* Better memory management.
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* Scales up to millions of time series and thousands of samples ingested
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per second.
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* Purging of obsolete samples much cleaner now, up to completely
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"forgetting" obsolete time series.
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* Proper instrumentation to diagnose the storage layer with... well...
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Prometheus.
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* Pure Go implementation, no need for cgo and shared C libraries anymore.
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* Better concurrency.
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* [ENHANCEMENT] Copy-on-write semantics in the AST layer.
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* [ENHANCEMENT] Switched from Go 1.3 to Go 1.4.
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* [ENHANCEMENT] Vendored external dependencies with godeps.
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* [ENHANCEMENT] Numerous Web UI improvements, moved to Bootstrap3 and
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Rickshaw 1.5.1.
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* [ENHANCEMENT] Improved Docker integration.
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* [ENHANCEMENT] Simplified the Makefile contraption.
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* [CLEANUP] Put meta-data files into proper shape (LICENSE, README.md etc.)
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* [CLEANUP] Removed all legitimate 'go vet' and 'golint' warnings.
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* [CLEANUP] Removed dead code.
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## 0.8.0 / 2014-09-04
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* [ENHANCEMENT] Stagger scrapes to spread out load.
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* [BUGFIX] Correctly quote HTTP Accept header.
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## 0.7.0 / 2014-08-06
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* [FEATURE] Added new functions: abs(), topk(), bottomk(), drop_common_labels().
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* [FEATURE] Let console templates get graph links from expressions.
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* [FEATURE] Allow console templates to dynamically include other templates.
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* [FEATURE] Template consoles now have access to their URL.
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* [BUGFIX] Fixed time() function to return evaluation time, not wallclock time.
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* [BUGFIX] Fixed HTTP connection leak when targets returned a non-200 status.
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* [BUGFIX] Fixed link to console templates in UI.
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* [PERFORMANCE] Removed extra memory copies while scraping targets.
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* [ENHANCEMENT] Switched from Go 1.2.1 to Go 1.3.
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* [ENHANCEMENT] Made metrics exported by Prometheus itself more consistent.
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* [ENHANCEMENT] Removed incremental backoffs for unhealthy targets.
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* [ENHANCEMENT] Dockerfile also builds Prometheus support tools now.
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## 0.6.0 / 2014-06-30
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* [FEATURE] Added console and alert templates support, along with various template functions.
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* [PERFORMANCE] Much faster and more memory-efficient flushing to disk.
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* [ENHANCEMENT] Query results are now only logged when debugging.
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* [ENHANCEMENT] Upgraded to new Prometheus client library for exposing metrics.
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* [BUGFIX] Samples are now kept in memory until fully flushed to disk.
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* [BUGFIX] Non-200 target scrapes are now treated as an error.
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* [BUGFIX] Added installation step for missing dependency to Dockerfile.
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* [BUGFIX] Removed broken and unused "User Dashboard" link.
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## 0.5.0 / 2014-05-28
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* [BUGFIX] Fixed next retrieval time display on status page.
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* [BUGFIX] Updated some variable references in tools subdir.
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* [FEATURE] Added support for scraping metrics via the new text format.
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* [PERFORMANCE] Improved label matcher performance.
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* [PERFORMANCE] Removed JSON indentation in query API, leading to smaller response sizes.
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* [ENHANCEMENT] Added internal check to verify temporal order of streams.
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* [ENHANCEMENT] Some internal refactorings.
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## 0.4.0 / 2014-04-17
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* [FEATURE] Vectors and scalars may now be reversed in binary operations (`<scalar> <binop> <vector>`).
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* [FEATURE] It's possible to shutdown Prometheus via a `/-/quit` web endpoint now.
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* [BUGFIX] Fix for a deadlock race condition in the memory storage.
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* [BUGFIX] Mac OS X build fixed.
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* [BUGFIX] Built from Go 1.2.1, which has internal fixes to race conditions in garbage collection handling.
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* [ENHANCEMENT] Internal storage interface refactoring that allows building e.g. the `rule_checker` tool without LevelDB dynamic library dependencies.
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* [ENHANCEMENT] Cleanups around shutdown handling.
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* [PERFORMANCE] Preparations for better memory reuse during marshalling / unmarshalling.
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