v1.0.4

Improvements

• Substantially improved meter registration performance.
• Add descriptive text to MeterNotFoundException which is thrown when registry.get("find.me")... fails to find a matching meter:

• All implementation-specific naming conventions that do some sanitization allow choice of base convention through a constructor parameter now.
• Graphite tags-as-prefix are applied in the order in which they are inserted by default.
• Performance of WebMVC tag creation optimized.
• Apply accept/distribution statistic config filters only if meter doesn't already exist (performance nit).
• Added check for empty values for lookup of Spring Boot property-based filter.

Fixes

• Composite meter registries now only update meters once regardless of how many times it appears in the child registry tree.
• We determined that cache miss counts cannot be calculated accurately for Hazelcast, so removed cache.gets with tag result=hit for Hazelcast. A metric cache.partition.gets was added for Hazelcast.
• Properly escape names and tags that are presented to monitoring systems in JSON.
• Explicitly shut down pause detector threads when the registry is closed.
• Preconfigure Atlas registry to rename tags that conflict with reserved names.
• Prometheus Timer and Summary now correctly decay percentiles (this was a regression in 1.0.3).
• Pass percentile precision to child Timer and DistributionSummary.
• Don't report NaN values to Influx.
• Restored a deprecated AbstractTimer constructor which was removed in 1.0.3 (which was a breaking change).

Deprecated

• StatsdConfig.queueSize(), which was unused.

v1.0.3

Improvements

• Timer and Distribution now conditionally use one of three histogram structures depending on which options you have selected to improve memory consumption in most cases. See the memory consumption table in the Micrometer Concepts doc for more.
• Pause compensation is now added to Timer max, so you can see the effect that system/VM pauses have on timed blocks of code.
• Make WebMvgTags use matched patterns for HTTP 404.
• Remove HierarchicalNameMapper as a configured @Bean so you can configure different hierarchical name mappers for different registries.

Fixes

• Formatting of large values shipped to New Relic that yielded a parsing error previously.
• MeterRegistryCustomizer for specific implementations now no longer can result in ClassCastException.
• Prometheus summary produces a +Inf bucket when histogram data or SLAs are sent.
• Fixed typo in hystrix binding conditional.
• Prometheus Timer max metric separated and reported separately from other elements of the Timer (but the name has not changed).

v1.0.2

Improvements

• Publish one last time on close for push-based systems.

Fixes

• Improve performance of TimeDecayingMax.rotate() for infrequently used timer dimensions.
• Make DoubleFormat independent of default locale.

v1.0.1

New Features/Improvements

• Group complex meter types under one event in New Relic.
• Can now set a custom sink for StatsD lines, allowing you to direct StatsD output to something other than UDP (e.g. messaging middleware).
• Influx registry logging level consistency and property deserialization improvements.
• Mark urlTemplate as nullable for RestTemplateExchangeTagsProvider

Fixes

• Encode metric name which is being used in URL for Datadog.
• Add slf4j-api dependency to registry implementations that depend on it.
• Change default Wavefront proxy port.
• Graphite FunctionTimers no longer return NaN. NaN gauges are not shipped to Graphite.
• StatsD metrics can now originate from multiple producers without conflict.

v1.0.0

Fix all Javadoc warnings, fix SignalFx tag key naming convention

v1.0.0-rc.6

New Features/Improvements

• Support for publishing to New Relic Insights API
• Align property name prefixes in micrometer-spring-legacy with names in Spring Boot 2 M7
• Pause detector is now configurable:
  • Can be swapped for a noop detector
  • The accuracy of the default clock-drift based detector can be configured to tradeoff CPU consumption for accuracy
• Timer/DistributionSummary max implementations have moved to a ring-buffer based approach to better line up with other summary stats in time
• Publish meter type metadata to Datadog
• Add Tomcat metrics
• Step registries now use a step-based function counter and function timer
• Improve configuration defaults for CloudWatch
• Improved counter naming for allocated and promoted bytes between GCs
• Add Tags#of shortcut for creating a single tag list of tags.
• Allow subclasses of PropertyMeterFilter to leverage the getMostSpecific method for looking up additional properties
• FunctionCounter and FunctionTimer are now pollable in the StatsD implementation
• Dropwizard improvements:
  • Map Micromter's Clock to Dropwizard's Clock type so the underlying Dropwizard meters obey Micrometer's notion of time
  • FunctionCounter can be made to report exponential moving averages like regular counters
  • FunctionTimer can be made to report exponential moving averages like regular timers
• CaffeineCacheMetrics constructor is now consistent with other OOTB binders

Fixes

• JMX exporter reports correct values for histogram percentile MBeans
• Fix formatting of Datadog percentile time series metric names
• Format metrics correctly independent of system locale
• Fix race condition in CompositeMeterRegistry#add
• MetricsFilter servlet filter now correctly tags HTTP 500 responses
• Fix conditional application of TomcatMetricsConfiguration
• Fix max in CumulativeTimer#measure
• Prometheus percentiles histogram never resets (is cumulative)
• Fix ClassCastException in CompositeMeterRegistry#add
• When a controller has async operation, the operation is now correctly timed once

v1.0.0-rc.5

New Features/Improvements

• Expose Hystrix metrics on time taken by http requests
• Add autoconfiguration for Hystrix metrics
• Add @Order to StringToDurationConverter so it doesn't conflict with custom converters
• Add preliminary AWS CloudWatch support
• Reduce thread contention on the map holding Meters inside a registry

Fixes

• Remove Guava's AtomicDouble from CumulativeCounter
• Improve conditional guard on WebMvcMetricsConfiguration
• DistributionSummary/Timer now exports valid Prometheus buckets
• Fixed naming convention for FunctionCounters exported to Prometheus

(Included in Spring Boot 2 M7)

v1.0.0-rc.4

New Features

• Property-based meter filters!
• SimpleMeterRegistry can now be configured to accumulate values or use a step-interval
• OkHttp instrumentation.
• Now validating user-provided HistogramConfigs
• Improved internal data structure of composite meters for better performance
• Improved histogram implementations allow for the retrieval of multiple percentiles/buckets in one call for better performance.
• Conditionally disable RestTemplate customizer to allow micrometer-spring-legacy to be used for older versions of Spring Boot (pre 1.5.x)
• Binders in MeterBindersConfiguration can now be disabled via properties
• ThreadPoolTaskExecutor metrics binder
• Jetty statistics binder
• Hibernate binder

Fixes

• WebMvcTags - Strip trailing URI slashes to limit dimensional explosion
• MetricsFilter now forwards to other filters when a matchable handler mapping cannot be found
• CumulativeDistributionSummary - prevent losing the maximum in case of data-race
• CumulativeTimer - prevent losing the maximum in case of data-race
• StatsD registry now accepts custom naming conventions
• Fix thread safety issues in MeterRegistry
• Add base unit to buffer pool metrics

v1.0.0-rc.3

New features

• Meter filters - allow for ignoring tags, adding common tags, ignoring whole metrics, etc at a registry level
• Replaced histogram and quantiles implementations with HdrHistogram
• Servlet metrics are recorded with a servlet Filter instead of HandlerInterceptor (metrics are now recorded for resources blocked by spring-security)
• HierarchicalNameMapper is now customizable for Etsy-flavored StatsD
• DatadogMeterRegistry matches the naming convention of dogstatsd
• Fluent builders for FunctionCounter and FunctionTimer
• Support collecting max for Prometheus timers
• Add processor metrics binder to the list of default binders autoconfigured by Spring
• Create DEFAULT for each registry implementation's config interface
• Add host property to datadog config so that traffic can pass through a proxy
• Meta-annotation support for @timed
• Add record method that accepts Duration to Timer

Fixes

• Servlet request metrics report the targetted URI in the event of an error rather than /error
• Adjust metric name for "system load average"
• Logback - MetricsTurboFilter no longer increments stats when is<LEVEL>Enabled() is called.
• Properly synchronize metrics creation (the symptom previously was duplicate lines in Prometheus output)
• Fixed file descriptor metrics names to match Prometheus standard
• Description is present for all meters registered to Prometheus
• Rename autoconfigured clock beans in Spring to avoid naming collisions
• Ensure MeterRegistryConfigurers are run before autoconfigured binders
• Add StringToDurationConverter to Prometheus configuration
• Fix erroneously set description set as baseunit for ThreadPoolExecutor

v1.0.0-rc.2

• Added support for Statsd (Etsy, Datadog, and Telegraf flavors).
• Added additional cache binders (Hazelcast, JCache, ConcurrentMapCache, Ehcache).
• Add property to select Graphite pickle or plaintext protocol.
• New technology compatibility kit to test custom registry implementations (extend MeterRegistryCompatibilityKit, found in micrometer-test).
• Narrow the use of synchronization to make Micrometer suitable for use in reactive apps.
• Add support for file descriptor metrics.
• Add database table size binder.
• New function-tracking timer to convert monotonically increasing counts/totalTimes from third-party APIs into a native timer form for various systems. Now you can do things like alert when your cache miss rate goes through the roof suddenly!
• FIX Histogram.percentiles() and Histogram.percentilesTimer() now produce valid Prometheus series.
• FIX Make WebMvcMetrics#tagWithException(ex) public again.
• FIX Duplicate dimensions when common tags are present.