prometheus/CHANGELOG.md

0.10.0 / 2015-01-26

• [CHANGE] More efficient JSON result format in query API. This requires up-to-date versions of PromDash and prometheus_cli, too.
• [ENHANCEMENT] Excluded non-minified Bootstrap assets and the Bootstrap maps from embedding into the binary. Those files are only used for debugging, and then you can use -web.use-local-assets. By including fewer files, the RAM usage during compilation is much more manageable.
• [ENHANCEMENT] Help link points to http://prometheus.github.io now.
• [FEATURE] Consoles for haproxy and cloudwatch.
• [BUGFIX] Several fixes to graphs in consoles.
• [CLEANUP] Removed a file size check that did not check anything.

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.

0.7.0 / 2014-08-06

• [FEATURE] Added new functions: abs(), topk(), bottomk(), drop_common_labels().
• [FEATURE] Let console templates get graph links from expressions.
• [FEATURE] Allow console templates to dynamically include other templates.
• [FEATURE] Template consoles now have access to their URL.
• [BUGFIX] Fixed time() function to return evaluation time, not wallclock time.
• [BUGFIX] Fixed HTTP connection leak when targets returned a non-200 status.
• [BUGFIX] Fixed link to console templates in UI.
• [PERFORMANCE] Removed extra memory copies while scraping targets.
• [ENHANCEMENT] Switched from Go 1.2.1 to Go 1.3.
• [ENHANCEMENT] Made metrics exported by Prometheus itself more consistent.
• [ENHANCEMENT] Removed incremental backoffs for unhealthy targets.
• [ENHANCEMENT] Dockerfile also builds Prometheus support tools now.

0.6.0 / 2014-06-30

• [FEATURE] Added console and alert templates support, along with various template functions.
• [PERFORMANCE] Much faster and more memory-efficient flushing to disk.
• [ENHANCEMENT] Query results are now only logged when debugging.
• [ENHANCEMENT] Upgraded to new Prometheus client library for exposing metrics.
• [BUGFIX] Samples are now kept in memory until fully flushed to disk.
• [BUGFIX] Non-200 target scrapes are now treated as an error.
• [BUGFIX] Added installation step for missing dependency to Dockerfile.
• [BUGFIX] Removed broken and unused "User Dashboard" link.

0.5.0 / 2014-05-28

• [BUGFIX] Fixed next retrieval time display on status page.
• [BUGFIX] Updated some variable references in tools subdir.
• [FEATURE] Added support for scraping metrics via the new text format.
• [PERFORMANCE] Improved label matcher performance.
• [PERFORMANCE] Removed JSON indentation in query API, leading to smaller response sizes.
• [ENHANCEMENT] Added internal check to verify temporal order of streams.
• [ENHANCEMENT] Some internal refactorings.

0.4.0 / 2014-04-17

• [FEATURE] Vectors and scalars may now be reversed in binary operations (<scalar> <binop> <vector>).
• [FEATURE] It's possible to shutdown Prometheus via a /-/quit web endpoint now.
• [BUGFIX] Fix for a deadlock race condition in the memory storage.
• [BUGFIX] Mac OS X build fixed.
• [BUGFIX] Built from Go 1.2.1, which has internal fixes to race conditions in garbage collection handling.
• [ENHANCEMENT] Internal storage interface refactoring that allows building e.g. the rule_checker tool without LevelDB dynamic library dependencies.
• [ENHANCEMENT] Cleanups around shutdown handling.
• [PERFORMANCE] Preparations for better memory reuse during marshalling / unmarshalling.