package opentelemetry.proto.profiles.v1development

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Specifies the method of aggregating metric values, either DELTA (change since last report) or CUMULATIVE (total since a fixed start time).

Used in: ValueType

• AGGREGATION_TEMPORALITY_UNSPECIFIED = 0

  UNSPECIFIED is the default AggregationTemporality, it MUST not be used.

• AGGREGATION_TEMPORALITY_DELTA = 1

  * DELTA is an AggregationTemporality for a profiler which reports changes since last report time. Successive metrics contain aggregation of values from continuous and non-overlapping intervals. The values for a DELTA metric are based only on the time interval associated with one measurement cycle. There is no dependency on previous measurements like is the case for CUMULATIVE metrics. For example, consider a system measuring the number of requests that it receives and reports the sum of these requests every second as a DELTA metric: 1. The system starts receiving at time=t_0. 2. A request is received, the system measures 1 request. 3. A request is received, the system measures 1 request. 4. A request is received, the system measures 1 request. 5. The 1 second collection cycle ends. A metric is exported for the number of requests received over the interval of time t_0 to t_0+1 with a value of 3. 6. A request is received, the system measures 1 request. 7. A request is received, the system measures 1 request. 8. The 1 second collection cycle ends. A metric is exported for the number of requests received over the interval of time t_0+1 to t_0+2 with a value of 2.

• AGGREGATION_TEMPORALITY_CUMULATIVE = 2

  * CUMULATIVE is an AggregationTemporality for a profiler which reports changes since a fixed start time. This means that current values of a CUMULATIVE metric depend on all previous measurements since the start time. Because of this, the sender is required to retain this state in some form. If this state is lost or invalidated, the CUMULATIVE metric values MUST be reset and a new fixed start time following the last reported measurement time sent MUST be used. For example, consider a system measuring the number of requests that it receives and reports the sum of these requests every second as a CUMULATIVE metric: 1. The system starts receiving at time=t_0. 2. A request is received, the system measures 1 request. 3. A request is received, the system measures 1 request. 4. A request is received, the system measures 1 request. 5. The 1 second collection cycle ends. A metric is exported for the number of requests received over the interval of time t_0 to t_0+1 with a value of 3. 6. A request is received, the system measures 1 request. 7. A request is received, the system measures 1 request. 8. The 1 second collection cycle ends. A metric is exported for the number of requests received over the interval of time t_0 to t_0+2 with a value of 5. 9. The system experiences a fault and loses state. 10. The system recovers and resumes receiving at time=t_1. 11. A request is received, the system measures 1 request. 12. The 1 second collection cycle ends. A metric is exported for the number of requests received over the interval of time t_1 to t_1+1 with a value of 1. Note: Even though, when reporting changes since last report time, using CUMULATIVE is valid, it is not recommended.

Represents a mapping between Attribute Keys and Units.

Used in: ProfilesData

• int32 attribute_key_strindex = 1

  Index into string table.

• int32 unit_strindex = 2

  Index into string table.

Describes a function, including its human-readable name, system name, source file, and starting line number in the source.

Used in: ProfilesData

• int32 name_strindex = 1

  Function name. Empty string if not available.

• int32 system_name_strindex = 2

  Function name, as identified by the system. For instance, it can be a C++ mangled name. Empty string if not available.

• int32 filename_strindex = 3

  Source file containing the function. Empty string if not available.

• int64 start_line = 4

  Line number in source file. 0 means unset.

Details a specific line in a source code, linked to a function.

Used in: Location

• int32 function_index = 1

  Reference to function in ProfilesData.function_table.

• int64 line = 2

  Line number in source code. 0 means unset.

• int64 column = 3

  Column number in source code. 0 means unset.

A pointer from a profile Sample to a trace Span. Connects a profile sample to a trace span, identified by unique trace and span IDs.

Used in: ProfilesData

• bytes trace_id = 1

  A unique identifier of a trace that this linked span is part of. The ID is a 16-byte array.

• bytes span_id = 2

  A unique identifier for the linked span. The ID is an 8-byte array.

Describes function and line table debug information.

Used in: ProfilesData

• optional int32 mapping_index = 1

  Reference to mapping in ProfilesData.mapping_table. It can be unset if the mapping is unknown or not applicable for this profile type.

• uint64 address = 2

  The instruction address for this location, if available. It should be within [Mapping.memory_start...Mapping.memory_limit] for the corresponding mapping. A non-leaf address may be in the middle of a call instruction. It is up to display tools to find the beginning of the instruction if necessary.

• repeated Line line = 3

  Multiple line indicates this location has inlined functions, where the last entry represents the caller into which the preceding entries were inlined. E.g., if memcpy() is inlined into printf: line[0].function_name == "memcpy" line[1].function_name == "printf"

• bool is_folded = 4

  Provides an indication that multiple symbols map to this location's address, for example due to identical code folding by the linker. In that case the line information above represents one of the multiple symbols. This field must be recomputed when the symbolization state of the profile changes.

• repeated int32 attribute_indices = 5

  References to attributes in ProfilesData.attribute_table. [optional]

Describes the mapping of a binary in memory, including its address range, file offset, and metadata like build ID

Used in: ProfilesData

• uint64 memory_start = 1

  Address at which the binary (or DLL) is loaded into memory.

• uint64 memory_limit = 2

  The limit of the address range occupied by this mapping.

• uint64 file_offset = 3

  Offset in the binary that corresponds to the first mapped address.

• int32 filename_strindex = 4

  The object this entry is loaded from. This can be a filename on disk for the main binary and shared libraries, or virtual abstractions like "[vdso]".

  Index into ProfilesData.string_table.

• repeated int32 attribute_indices = 5

  References to attributes in ProfilesData.attribute_table. [optional]

• bool has_functions = 6

  The following fields indicate the resolution of symbolic info.

• bool has_filenames = 7

• bool has_line_numbers = 8

• bool has_inline_frames = 9

Represents a complete profile, including sample types, samples, mappings to binaries, locations, functions, string table, and additional metadata. It modifies and annotates pprof Profile with OpenTelemetry specific fields. Note that whilst fields in this message retain the name and field id from pprof in most cases for ease of understanding data migration, it is not intended that pprof:Profile and OpenTelemetry:Profile encoding be wire compatible.

Used in: ScopeProfiles

• repeated ValueType sample_type = 1

  A description of the samples associated with each Sample.value. For a cpu profile this might be: [["cpu","nanoseconds"]] or [["wall","seconds"]] or [["syscall","count"]] For a heap profile, this might be: [["allocations","count"], ["space","bytes"]], If one of the values represents the number of events represented by the sample, by convention it should be at index 0 and use sample_type.unit == "count".

• repeated Sample sample = 2

  The set of samples recorded in this profile.

• repeated int32 location_indices = 3

  References to locations in ProfilesData.location_table.

• int64 time_nanos = 4

  Time of collection (UTC) represented as nanoseconds past the epoch.

• int64 duration_nanos = 5

  Duration of the profile, if a duration makes sense.

• optional ValueType period_type = 6

  The kind of events between sampled occurrences. e.g [ "cpu","cycles" ] or [ "heap","bytes" ]

• int64 period = 7

  The number of events between sampled occurrences.

• repeated int32 comment_strindices = 8

  Free-form text associated with the profile. The text is displayed as is to the user by the tools that read profiles (e.g. by pprof). This field should not be used to store any machine-readable information, it is only for human-friendly content. The profile must stay functional if this field is cleaned.

  Indices into ProfilesData.string_table.

• int32 default_sample_type_index = 9

  Index into the sample_type array to the default sample type.

• bytes profile_id = 10

  A globally unique identifier for a profile. The ID is a 16-byte array. An ID with all zeroes is considered invalid. This field is required.

• uint32 dropped_attributes_count = 11

  dropped_attributes_count is the number of attributes that were discarded. Attributes can be discarded because their keys are too long or because there are too many attributes. If this value is 0, then no attributes were dropped.

• string original_payload_format = 12

  Specifies format of the original payload. Common values are defined in semantic conventions. [required if original_payload is present]

• bytes original_payload = 13

  Original payload can be stored in this field. This can be useful for users who want to get the original payload. Formats such as JFR are highly extensible and can contain more information than what is defined in this spec. Inclusion of original payload should be configurable by the user. Default behavior should be to not include the original payload. If the original payload is in pprof format, it SHOULD not be included in this field. The field is optional, however if it is present then equivalent converted data should be populated in other fields of this message as far as is practicable.

• repeated int32 attribute_indices = 14

  References to attributes in attribute_table. [optional] It is a collection of key/value pairs. Note, global attributes like server name can be set using the resource API. Examples of attributes: "/http/user_agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36" "/http/server_latency": 300 "abc.com/myattribute": true "abc.com/score": 10.239 The OpenTelemetry API specification further restricts the allowed value types: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/common/README.md#attribute Attribute keys MUST be unique (it is not allowed to have more than one attribute with the same key).

ProfilesData represents the profiles data that can be stored in persistent storage, OR can be embedded by other protocols that transfer OTLP profiles data but do not implement the OTLP protocol. The main difference between this message and collector protocol is that in this message there will not be any "control" or "metadata" specific to OTLP protocol. When new fields are added into this message, the OTLP request MUST be updated as well.

• repeated ResourceProfiles resource_profiles = 1

  An array of ResourceProfiles. For data coming from an SDK profiler, this array will typically contain one element. Host-level profilers will usually create one ResourceProfile per container, as well as one additional ResourceProfile grouping all samples from non-containerized processes. Other resource groupings are possible as well and clarified via Resource.attributes and semantic conventions.

• repeated Mapping mapping_table = 2

  Mappings from address ranges to the image/binary/library mapped into that address range referenced by locations via Location.mapping_index.

• repeated Location location_table = 3

  Locations referenced by samples via Profile.location_indices.

• repeated Function function_table = 4

  Functions referenced by locations via Line.function_index.

• repeated Link link_table = 5

  Links referenced by samples via Sample.link_index.

• repeated string string_table = 6

  A common table for strings referenced by various messages. string_table[0] must always be "".

• repeated common.v1.KeyValue attribute_table = 7

  A common table for attributes referenced by various messages.

• repeated AttributeUnit attribute_units = 8

  Represents a mapping between Attribute Keys and Units.

A collection of ScopeProfiles from a Resource.

Used in: collector.profiles.v1development.ExportProfilesServiceRequest, ProfilesData

• optional resource.v1.Resource resource = 1

  The resource for the profiles in this message. If this field is not set then no resource info is known.

• repeated ScopeProfiles scope_profiles = 2

  A list of ScopeProfiles that originate from a resource.

• string schema_url = 3

  The Schema URL, if known. This is the identifier of the Schema that the resource data is recorded in. Notably, the last part of the URL path is the version number of the schema: http[s]://server[:port]/path/<version>. To learn more about Schema URL see https://opentelemetry.io/docs/specs/otel/schemas/#schema-url This schema_url applies to the data in the "resource" field. It does not apply to the data in the "scope_profiles" field which have their own schema_url field.

Each Sample records values encountered in some program context. The program context is typically a stack trace, perhaps augmented with auxiliary information like the thread-id, some indicator of a higher level request being handled etc.

Used in: Profile

• int32 locations_start_index = 1

  locations_start_index along with locations_length refers to to a slice of locations in Profile.location_indices.

• int32 locations_length = 2

  locations_length along with locations_start_index refers to a slice of locations in Profile.location_indices. Supersedes location_index.

• repeated int64 value = 3

  The type and unit of each value is defined by the corresponding entry in Profile.sample_type. All samples must have the same number of values, the same as the length of Profile.sample_type. When aggregating multiple samples into a single sample, the result has a list of values that is the element-wise sum of the lists of the originals.

• repeated int32 attribute_indices = 4

  References to attributes in ProfilesData.attribute_table. [optional]

• optional int32 link_index = 5

  Reference to link in ProfilesData.link_table. [optional]

• repeated uint64 timestamps_unix_nano = 6

  Timestamps associated with Sample represented in nanoseconds. These timestamps are expected to fall within the Profile's time range. [optional]

A collection of Profiles produced by an InstrumentationScope.

Used in: ResourceProfiles

• optional common.v1.InstrumentationScope scope = 1

  The instrumentation scope information for the profiles in this message. Semantically when InstrumentationScope isn't set, it is equivalent with an empty instrumentation scope name (unknown).

• repeated Profile profiles = 2

  A list of Profiles that originate from an instrumentation scope.

• string schema_url = 3

  The Schema URL, if known. This is the identifier of the Schema that the profile data is recorded in. Notably, the last part of the URL path is the version number of the schema: http[s]://server[:port]/path/<version>. To learn more about Schema URL see https://opentelemetry.io/docs/specs/otel/schemas/#schema-url This schema_url applies to all profiles in the "profiles" field.

ValueType describes the type and units of a value, with an optional aggregation temporality.

Used in: Profile

• int32 type_strindex = 1

  Index into ProfilesData.string_table.

• int32 unit_strindex = 2

  Index into ProfilesData.string_table.

• AggregationTemporality aggregation_temporality = 3