Class: OpenTelemetry::Metrics::Meter

Inherits:

Object

Object
OpenTelemetry::Metrics::Meter

show all

Defined in:: lib/opentelemetry/metrics/meter.rb

Overview

No-op implementation of Meter.

Direct Known Subclasses

Internal::ProxyMeter

Constant Summary collapse

NAME_REGEX =

%r{\A[a-zA-Z][-./\w]{0,254}\z}

DuplicateInstrumentError = rubocop:disable Style/EmptyClassDefinition

Class.new(OpenTelemetry::Error)

InstrumentNameError =

Class.new(OpenTelemetry::Error)

InstrumentUnitError =

Class.new(OpenTelemetry::Error)

InstrumentDescriptionError =

Class.new(OpenTelemetry::Error)

Instance Method Summary collapse

#create_counter(name, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ nil
Counter is a synchronous Instrument which supports non-negative increments.
#create_gauge(name, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ nil
Gauge is an synchronous Instrument which reports non-additive value(s).
#create_histogram(name, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ nil
Histogram is a synchronous Instrument which can be used to report arbitrary values that are likely to be statistically meaningful.
#create_observable_counter(name, callback: nil, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ nil
ObservableCounter is an asynchronous Instrument which reports monotonically increasing value(s) when the instrument is being observed.
#create_observable_gauge(name, callback: nil, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ nil
ObservableGauge is an asynchronous Instrument which reports non-additive value(s) (e.g. the room temperature - it makes no sense to report the temperature value from multiple rooms and sum them up) when the instrument is being observed.
#create_observable_up_down_counter(name, callback: nil, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ nil
ObservableUpDownCounter is an asynchronous Instrument which reports additive value(s) (e.g. the process heap size - it makes sense to report the heap size from multiple processes and sum them up, so we get the total heap usage) when the instrument is being observed.
#create_up_down_counter(name, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ nil
UpDownCounter is a synchronous Instrument which supports increments and decrements.
#initialize ⇒ Meter constructor
rubocop:enable Style/EmptyClassDefinition.
#register_callback(instruments, callback) ⇒ nil
Registers a callback function against a declared set of asynchronous instruments from this Meter.
#unregister(instruments, callback) ⇒ nil
Unregisters a callback function previously registered via #register_callback.

Constructor Details

#initialize ⇒ `Meter`

rubocop:enable Style/EmptyClassDefinition

# File 'lib/opentelemetry/metrics/meter.rb', line 30

def initialize
  @mutex = Mutex.new
  @instrument_registry = {}
end

Instance Method Details

#create_counter(name, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ `nil`

Counter is a synchronous Instrument which supports non-negative increments.

With this api call:

exception_counter = meter.create_counter("exceptions",
                                       description: "number of exceptions caught",
                                       unit: 's',
                                       exemplar_filter: OpenTelemetry::SDK::Metrics::Exemplar::TraceBasedExemplarFilter,
                                       exemplar_reservoir: OpenTelemetry::SDK::Metrics::Exemplar::SimpleFixedSizeExemplarReservoir.new)

Parameters:

name (String) —
the name of the counter
unit (optional String) (defaults to: nil) —
an optional string provided by user.
description (optional String) (defaults to: nil) —
an optional free-form text provided by user.
exemplar_filter (optional Object) (defaults to: nil) —
an optional filter to control which measurements are eligible to become exemplars. Must respond to #should_sample?. Available SDK implementations:
- OpenTelemetry::SDK::Metrics::Exemplar::AlwaysOnExemplarFilter - all measurements are eligible
- OpenTelemetry::SDK::Metrics::Exemplar::AlwaysOffExemplarFilter - no measurements are eligible
- OpenTelemetry::SDK::Metrics::Exemplar::TraceBasedExemplarFilter - only measurements in a sampled span context are eligible
exemplar_reservoir (optional Object) (defaults to: nil) —
an optional reservoir used to sample exemplars from eligible measurements. Must respond to #offer and #collect. Available SDK implementations:
- OpenTelemetry::SDK::Metrics::Exemplar::SimpleFixedSizeExemplarReservoir - uniformly-weighted sampling
- OpenTelemetry::SDK::Metrics::Exemplar::AlignedHistogramBucketExemplarReservoir - one exemplar per histogram bucket (recommended for histograms)
- OpenTelemetry::SDK::Metrics::Exemplar::NoopExemplarReservoir - no-op, disables exemplar collection
advisory (optional Hash) (defaults to: nil) —
optional advisory parameters: recommendations from the instrument author that implementations MAY ignore. The API does not validate them. @option advisory [Array] :attributes Recommended set of attribute keys for the resulting metrics. @option advisory [Array] :explicit_bucket_boundaries Applies to histograms only and has no effect here.

Returns:

(nil) —
after creation of counter, it will be stored in instrument_registry



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# File 'lib/opentelemetry/metrics/meter.rb', line 64

def create_counter(name, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil)
  create_instrument(:counter, name, unit, description, nil, exemplar_filter, exemplar_reservoir, advisory) { COUNTER }
end

#create_gauge(name, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ `nil`

Gauge is an synchronous Instrument which reports non-additive value(s)

With this api call:

meter.create_gauge("cpu.frequency",
                  description: "the real-time CPU clock speed",
                  unit: "ms",
                  exemplar_filter: OpenTelemetry::SDK::Metrics::Exemplar::TraceBasedExemplarFilter,
                  exemplar_reservoir: OpenTelemetry::SDK::Metrics::Exemplar::SimpleFixedSizeExemplarReservoir.new)

Parameters:

name (String) —
the name of the gauge.
unit (optional String) (defaults to: nil) —
an optional string provided by user.
description (optional String) (defaults to: nil) —
an optional free-form text provided by user.
exemplar_filter (optional Object) (defaults to: nil) —
an optional filter to control which measurements are eligible to become exemplars. Must respond to #should_sample?. Available SDK implementations:
- OpenTelemetry::SDK::Metrics::Exemplar::AlwaysOnExemplarFilter - all measurements are eligible
- OpenTelemetry::SDK::Metrics::Exemplar::AlwaysOffExemplarFilter - no measurements are eligible
- OpenTelemetry::SDK::Metrics::Exemplar::TraceBasedExemplarFilter - only measurements in a sampled span context are eligible
exemplar_reservoir (optional Object) (defaults to: nil) —
an optional reservoir used to sample exemplars from eligible measurements. Must respond to #offer and #collect. Available SDK implementations:
- OpenTelemetry::SDK::Metrics::Exemplar::SimpleFixedSizeExemplarReservoir - uniformly-weighted sampling
- OpenTelemetry::SDK::Metrics::Exemplar::AlignedHistogramBucketExemplarReservoir - one exemplar per histogram bucket (recommended for histograms)
- OpenTelemetry::SDK::Metrics::Exemplar::NoopExemplarReservoir - no-op, disables exemplar collection
advisory (optional Hash) (defaults to: nil) —
optional advisory parameters: recommendations from the instrument author that implementations MAY ignore. The API does not validate them. @option advisory [Array] :attributes Recommended set of attribute keys for the resulting metrics. @option advisory [Array] :explicit_bucket_boundaries Applies to histograms only and has no effect here.

Returns:

(nil) —
after creation of gauge, it will be stored in instrument_registry



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# File 'lib/opentelemetry/metrics/meter.rb', line 133

def create_gauge(name, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil)
  create_instrument(:gauge, name, unit, description, nil, exemplar_filter, exemplar_reservoir, advisory) { GAUGE }
end

#create_histogram(name, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ `nil`

Histogram is a synchronous Instrument which can be used to report arbitrary values that are likely to be statistically meaningful. It is intended for statistics such as histograms, summaries, and percentiles.

With this api call:

http_server_duration = meter.create_histogram("http.server.duration",
                                            description: "measures the duration of the inbound HTTP request",
                                            unit: "s",
                                            exemplar_filter: OpenTelemetry::SDK::Metrics::Exemplar::TraceBasedExemplarFilter,
                                            exemplar_reservoir: OpenTelemetry::SDK::Metrics::Exemplar::AlignedHistogramBucketExemplarReservoir.new)

Parameters:

name (String) —
the name of the histogram
unit (optional String) (defaults to: nil) —
an optional string provided by user.
description (optional String) (defaults to: nil) —
an optional free-form text provided by user.
exemplar_filter (optional Object) (defaults to: nil) —
an optional filter to control which measurements are eligible to become exemplars. Must respond to #should_sample?. Available SDK implementations:
- OpenTelemetry::SDK::Metrics::Exemplar::AlwaysOnExemplarFilter - all measurements are eligible
- OpenTelemetry::SDK::Metrics::Exemplar::AlwaysOffExemplarFilter - no measurements are eligible
- OpenTelemetry::SDK::Metrics::Exemplar::TraceBasedExemplarFilter - only measurements in a sampled span context are eligible
exemplar_reservoir (optional Object) (defaults to: nil) —
an optional reservoir used to sample exemplars from eligible measurements. Must respond to #offer and #collect. Available SDK implementations:
- OpenTelemetry::SDK::Metrics::Exemplar::SimpleFixedSizeExemplarReservoir - uniformly-weighted sampling
- OpenTelemetry::SDK::Metrics::Exemplar::AlignedHistogramBucketExemplarReservoir - one exemplar per histogram bucket (recommended for histograms)
- OpenTelemetry::SDK::Metrics::Exemplar::NoopExemplarReservoir - no-op, disables exemplar collection
advisory (optional Hash) (defaults to: nil) —
optional advisory parameters: recommendations from the instrument author that implementations MAY ignore. The API does not validate them. @option advisory [Array] :explicit_bucket_boundaries Recommended bucket boundaries when this instrument is aggregated to an explicit bucket histogram. @option advisory [Array] :attributes Recommended set of attribute keys for the resulting metrics.

Returns:

(nil) —
after creation of histogram, it will be stored in instrument_registry



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# File 'lib/opentelemetry/metrics/meter.rb', line 100

def create_histogram(name, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil)
  create_instrument(:histogram, name, unit, description, nil, exemplar_filter, exemplar_reservoir, advisory) { HISTOGRAM }
end

#create_observable_counter(name, callback: nil, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ `nil`

ObservableCounter is an asynchronous Instrument which reports monotonically increasing value(s) when the instrument is being observed.

With this api call:

pf_callback = -> { # collect metrics here }
meter.create_observable_counter("PF",
                               pf_callback,
                               description: "process page faults",
                               unit: 'ms',
                               exemplar_filter: OpenTelemetry::SDK::Metrics::Exemplar::TraceBasedExemplarFilter,
                               exemplar_reservoir: OpenTelemetry::SDK::Metrics::Exemplar::SimpleFixedSizeExemplarReservoir.new)

Parameters:

name (String) —
the name of the observable_counter
callback (optional Proc, Array<Proc>) (defaults to: nil) —
zero or more callback functions used to collect metrics
unit (optional String) (defaults to: nil) —
an optional string provided by user.
description (optional String) (defaults to: nil) —
an optional free-form text provided by user.
exemplar_filter (optional Object) (defaults to: nil) —
an optional filter to control which measurements are eligible to become exemplars. Must respond to #should_sample?. Available SDK implementations:
- OpenTelemetry::SDK::Metrics::Exemplar::AlwaysOnExemplarFilter - all measurements are eligible
- OpenTelemetry::SDK::Metrics::Exemplar::AlwaysOffExemplarFilter - no measurements are eligible
- OpenTelemetry::SDK::Metrics::Exemplar::TraceBasedExemplarFilter - only measurements in a sampled span context are eligible
exemplar_reservoir (optional Object) (defaults to: nil) —
an optional reservoir used to sample exemplars from eligible measurements. Must respond to #offer and #collect. Available SDK implementations:
- OpenTelemetry::SDK::Metrics::Exemplar::SimpleFixedSizeExemplarReservoir - uniformly-weighted sampling
- OpenTelemetry::SDK::Metrics::Exemplar::AlignedHistogramBucketExemplarReservoir - one exemplar per histogram bucket (recommended for histograms)
- OpenTelemetry::SDK::Metrics::Exemplar::NoopExemplarReservoir - no-op, disables exemplar collection
advisory (optional Hash) (defaults to: nil) —
optional advisory parameters: recommendations from the instrument author that implementations MAY ignore. The API does not validate them. @option advisory [Array] :attributes Recommended set of attribute keys for the resulting metrics. @option advisory [Array] :explicit_bucket_boundaries Applies to histograms only and has no effect here.

Returns:

(nil) —
after creation of observable_counter, it will be stored in instrument_registry



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# File 'lib/opentelemetry/metrics/meter.rb', line 203

def create_observable_counter(name, callback: nil, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil)
  create_instrument(:observable_counter, name, unit, description, callback, exemplar_filter, exemplar_reservoir, advisory) { OBSERVABLE_COUNTER }
end

#create_observable_gauge(name, callback: nil, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ `nil`

ObservableGauge is an asynchronous Instrument which reports non-additive value(s) (e.g. the room temperature - it makes no sense to report the temperature value from multiple rooms and sum them up) when the instrument is being observed.

With this api call:

pf_callback = -> { # collect metrics here }
meter.create_observable_gauge("cpu.frequency",
                             pf_callback,
                             description: "the real-time CPU clock speed",
                             unit: 'ms',
                             exemplar_filter: OpenTelemetry::SDK::Metrics::Exemplar::TraceBasedExemplarFilter,
                             exemplar_reservoir: OpenTelemetry::SDK::Metrics::Exemplar::SimpleFixedSizeExemplarReservoir.new)

Parameters:

name (String) —
the name of the observable_gauge
callback (optional Proc, Array<Proc>) (defaults to: nil) —
zero or more callback functions used to collect metrics
unit (optional String) (defaults to: nil) —
an optional string provided by user.
description (optional String) (defaults to: nil) —
an optional free-form text provided by user.
exemplar_filter (optional Object) (defaults to: nil) —
an optional filter to control which measurements are eligible to become exemplars. Must respond to #should_sample?. Available SDK implementations:
- OpenTelemetry::SDK::Metrics::Exemplar::AlwaysOnExemplarFilter - all measurements are eligible
- OpenTelemetry::SDK::Metrics::Exemplar::AlwaysOffExemplarFilter - no measurements are eligible
- OpenTelemetry::SDK::Metrics::Exemplar::TraceBasedExemplarFilter - only measurements in a sampled span context are eligible
exemplar_reservoir (optional Object) (defaults to: nil) —
an optional reservoir used to sample exemplars from eligible measurements. Must respond to #offer and #collect. Available SDK implementations:
- OpenTelemetry::SDK::Metrics::Exemplar::SimpleFixedSizeExemplarReservoir - uniformly-weighted sampling
- OpenTelemetry::SDK::Metrics::Exemplar::AlignedHistogramBucketExemplarReservoir - one exemplar per histogram bucket (recommended for histograms)
- OpenTelemetry::SDK::Metrics::Exemplar::NoopExemplarReservoir - no-op, disables exemplar collection
advisory (optional Hash) (defaults to: nil) —
optional advisory parameters: recommendations from the instrument author that implementations MAY ignore. The API does not validate them. @option advisory [Array] :attributes Recommended set of attribute keys for the resulting metrics. @option advisory [Array] :explicit_bucket_boundaries Applies to histograms only and has no effect here.

Returns:

(nil) —
after creation of observable_gauge, it will be stored in instrument_registry



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# File 'lib/opentelemetry/metrics/meter.rb', line 241

def create_observable_gauge(name, callback: nil, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil)
  create_instrument(:observable_gauge, name, unit, description, callback, exemplar_filter, exemplar_reservoir, advisory) { OBSERVABLE_GAUGE }
end

#create_observable_up_down_counter(name, callback: nil, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ `nil`

ObservableUpDownCounter is an asynchronous Instrument which reports additive value(s) (e.g. the process heap size - it makes sense to report the heap size from multiple processes and sum them up, so we get the total heap usage) when the instrument is being observed.

With this api call:

pf_callback = -> { # collect metrics here }
meter.create_observable_up_down_counter("process.workingset",
                                       pf_callback,
                                       description: "process working set",
                                       unit: 'KB',
                                       exemplar_filter: OpenTelemetry::SDK::Metrics::Exemplar::TraceBasedExemplarFilter,
                                       exemplar_reservoir: OpenTelemetry::SDK::Metrics::Exemplar::SimpleFixedSizeExemplarReservoir.new)

Parameters:

name (String) —
the name of the observable_up_down_counter
callback (optional Proc, Array<Proc>) (defaults to: nil) —
zero or more callback functions used to collect metrics
unit (optional String) (defaults to: nil) —
an optional string provided by user.
description (optional String) (defaults to: nil) —
an optional free-form text provided by user.
exemplar_filter (optional Object) (defaults to: nil) —
an optional filter to control which measurements are eligible to become exemplars. Must respond to #should_sample?. Available SDK implementations:
- OpenTelemetry::SDK::Metrics::Exemplar::AlwaysOnExemplarFilter - all measurements are eligible
- OpenTelemetry::SDK::Metrics::Exemplar::AlwaysOffExemplarFilter - no measurements are eligible
- OpenTelemetry::SDK::Metrics::Exemplar::TraceBasedExemplarFilter - only measurements in a sampled span context are eligible
exemplar_reservoir (optional Object) (defaults to: nil) —
an optional reservoir used to sample exemplars from eligible measurements. Must respond to #offer and #collect. Available SDK implementations:
- OpenTelemetry::SDK::Metrics::Exemplar::SimpleFixedSizeExemplarReservoir - uniformly-weighted sampling
- OpenTelemetry::SDK::Metrics::Exemplar::AlignedHistogramBucketExemplarReservoir - one exemplar per histogram bucket (recommended for histograms)
- OpenTelemetry::SDK::Metrics::Exemplar::NoopExemplarReservoir - no-op, disables exemplar collection
advisory (optional Hash) (defaults to: nil) —
optional advisory parameters: recommendations from the instrument author that implementations MAY ignore. The API does not validate them. @option advisory [Array] :attributes Recommended set of attribute keys for the resulting metrics. @option advisory [Array] :explicit_bucket_boundaries Applies to histograms only and has no effect here.

Returns:

(nil) —
after creation of observable_up_down_counter, it will be stored in instrument_registry



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# File 'lib/opentelemetry/metrics/meter.rb', line 279

def create_observable_up_down_counter(name, callback: nil, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil)
  create_instrument(:observable_up_down_counter, name, unit, description, callback, exemplar_filter, exemplar_reservoir, advisory) { OBSERVABLE_UP_DOWN_COUNTER }
end

#create_up_down_counter(name, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ `nil`

UpDownCounter is a synchronous Instrument which supports increments and decrements.

With this api call:

items_counter = meter.create_up_down_counter("store.inventory",
                                           description: "the number of the items available",
                                           unit: "s",
                                           exemplar_filter: OpenTelemetry::SDK::Metrics::Exemplar::TraceBasedExemplarFilter,
                                           exemplar_reservoir: OpenTelemetry::SDK::Metrics::Exemplar::SimpleFixedSizeExemplarReservoir.new)

Parameters:

name (String) —
the name of the up_down_counter
unit (optional String) (defaults to: nil) —
an optional string provided by user.
description (optional String) (defaults to: nil) —
an optional free-form text provided by user.
exemplar_filter (optional Object) (defaults to: nil) —
an optional filter to control which measurements are eligible to become exemplars. Must respond to #should_sample?. Available SDK implementations:
- OpenTelemetry::SDK::Metrics::Exemplar::AlwaysOnExemplarFilter - all measurements are eligible
- OpenTelemetry::SDK::Metrics::Exemplar::AlwaysOffExemplarFilter - no measurements are eligible
- OpenTelemetry::SDK::Metrics::Exemplar::TraceBasedExemplarFilter - only measurements in a sampled span context are eligible
exemplar_reservoir (optional Object) (defaults to: nil) —
an optional reservoir used to sample exemplars from eligible measurements. Must respond to #offer and #collect. Available SDK implementations:
- OpenTelemetry::SDK::Metrics::Exemplar::SimpleFixedSizeExemplarReservoir - uniformly-weighted sampling
- OpenTelemetry::SDK::Metrics::Exemplar::AlignedHistogramBucketExemplarReservoir - one exemplar per histogram bucket (recommended for histograms)
- OpenTelemetry::SDK::Metrics::Exemplar::NoopExemplarReservoir - no-op, disables exemplar collection
advisory (optional Hash) (defaults to: nil) —
optional advisory parameters: recommendations from the instrument author that implementations MAY ignore. The API does not validate them. @option advisory [Array] :attributes Recommended set of attribute keys for the resulting metrics. @option advisory [Array] :explicit_bucket_boundaries Applies to histograms only and has no effect here.

Returns:

(nil) —
after creation of up_down_counter, it will be stored in instrument_registry



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# File 'lib/opentelemetry/metrics/meter.rb', line 166

def create_up_down_counter(name, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil)
  create_instrument(:up_down_counter, name, unit, description, nil, exemplar_filter, exemplar_reservoir, advisory) { UP_DOWN_COUNTER }
end

#register_callback(instruments, callback) ⇒ `nil`

Registers a callback function against a declared set of asynchronous instruments from this Meter.

Parameters:

instruments (Array) —
the asynchronous instruments the callback function reports Measurements for
callback (Proc) —
the callback function

Returns:

(nil)



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# File 'lib/opentelemetry/metrics/meter.rb', line 289

def register_callback(instruments, callback)
  instruments.each { |instrument| instrument.register_callback(callback) }
end

#unregister(instruments, callback) ⇒ `nil`

Unregisters a callback function previously registered via #register_callback.

Parameters:

instruments (Array) —
the asynchronous instruments the callback function was registered against
callback (Proc) —
the callback function

Returns:

(nil)



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# File 'lib/opentelemetry/metrics/meter.rb', line 299

def unregister(instruments, callback)
  instruments.each { |instrument| instrument.unregister(callback) }
end

Class: OpenTelemetry::Metrics::Meter

Overview

Direct Known Subclasses

Constant Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Meter

Instance Method Details

#create_counter(name, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ nil

#create_gauge(name, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ nil

#create_histogram(name, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ nil

#create_observable_counter(name, callback: nil, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ nil

#create_observable_gauge(name, callback: nil, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ nil

#create_observable_up_down_counter(name, callback: nil, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ nil

#create_up_down_counter(name, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ nil

#register_callback(instruments, callback) ⇒ nil

#unregister(instruments, callback) ⇒ nil

#initialize ⇒ `Meter`

#create_counter(name, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ `nil`

#create_gauge(name, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ `nil`

#create_histogram(name, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ `nil`

#create_observable_counter(name, callback: nil, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ `nil`

#create_observable_gauge(name, callback: nil, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ `nil`

#create_observable_up_down_counter(name, callback: nil, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ `nil`

#create_up_down_counter(name, unit: nil, description: nil, exemplar_filter: nil, exemplar_reservoir: nil, advisory: nil) ⇒ `nil`

#register_callback(instruments, callback) ⇒ `nil`

#unregister(instruments, callback) ⇒ `nil`