package opentelemetry.proto.trace.v1

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AnyValue is used to represent any type of attribute value. AnyValue may contain a primitive value such as a string or integer or it may contain an arbitrary nested object containing arrays, key-value lists and primitives.

Used in: ArrayValue, KeyValue

• oneof value

  The value is one of the listed fields. It is valid for all values to be unspecified in which case this AnyValue is considered to be "empty".

  • string string_value = 1

  • bool bool_value = 2

  • int64 int_value = 3

  • double double_value = 4

  • ArrayValue array_value = 5

  • KeyValueList kvlist_value = 6

  • bytes bytes_value = 7

ArrayValue is a list of AnyValue messages. We need ArrayValue as a message since oneof in AnyValue does not allow repeated fields.

Used in: AnyValue

• repeated AnyValue values = 1

  Array of values. The array may be empty (contain 0 elements).

InstrumentationScope is a message representing the instrumentation scope information such as the fully qualified name and version.

Used in: ScopeSpans

• string name = 1

  An empty instrumentation scope name means the name is unknown.

• string version = 2

• repeated KeyValue attributes = 3

  Additional attributes that describe the scope. [Optional]. Attribute keys MUST be unique (it is not allowed to have more than one attribute with the same key).

• uint32 dropped_attributes_count = 4

KeyValue is a key-value pair that is used to store Span attributes, Link attributes, etc.

Used in: InstrumentationScope, KeyValueList, Resource, Span, Span.Event, Span.Link

• string key = 1

• optional AnyValue value = 2

KeyValueList is a list of KeyValue messages. We need KeyValueList as a message since `oneof` in AnyValue does not allow repeated fields. Everywhere else where we need a list of KeyValue messages (e.g. in Span) we use `repeated KeyValue` directly to avoid unnecessary extra wrapping (which slows down the protocol). The 2 approaches are semantically equivalent.

Used in: AnyValue

• repeated KeyValue values = 1

  A collection of key/value pairs of key-value pairs. The list may be empty (may contain 0 elements). The keys MUST be unique (it is not allowed to have more than one value with the same key).

Resource information.

Used in: ResourceSpans

• repeated KeyValue attributes = 1

  Set of attributes that describe the resource. Attribute keys MUST be unique (it is not allowed to have more than one attribute with the same key).

• uint32 dropped_attributes_count = 2

  dropped_attributes_count is the number of dropped attributes. If the value is 0, then no attributes were dropped.

A collection of ScopeSpans from a Resource.

Used in: TracesData

• optional Resource resource = 1

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

• repeated ScopeSpans scope_spans = 2

  A list of ScopeSpans 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. 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_spans" field which have their own schema_url field.

A collection of Spans produced by an InstrumentationScope.

Used in: ResourceSpans

• optional InstrumentationScope scope = 1

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

• repeated Span spans = 2

  A list of Spans that originate from an instrumentation scope.

• string schema_url = 3

  The Schema URL, if known. This is the identifier of the Schema that the span data is recorded in. To learn more about Schema URL see https://opentelemetry.io/docs/specs/otel/schemas/#schema-url This schema_url applies to all spans and span events in the "spans" field.

A Span represents a single operation performed by a single component of the system. The next available field id is 17.

Used in: ScopeSpans

• bytes trace_id = 1

  A unique identifier for a trace. All spans from the same trace share the same `trace_id`. The ID is a 16-byte array. An ID with all zeroes OR of length other than 16 bytes is considered invalid (empty string in OTLP/JSON is zero-length and thus is also invalid). This field is required.

• bytes span_id = 2

  A unique identifier for a span within a trace, assigned when the span is created. The ID is an 8-byte array. An ID with all zeroes OR of length other than 8 bytes is considered invalid (empty string in OTLP/JSON is zero-length and thus is also invalid). This field is required.

• string trace_state = 3

  trace_state conveys information about request position in multiple distributed tracing graphs. It is a trace_state in w3c-trace-context format: https://www.w3.org/TR/trace-context/#tracestate-header See also https://github.com/w3c/distributed-tracing for more details about this field.

• bytes parent_span_id = 4

  The `span_id` of this span's parent span. If this is a root span, then this field must be empty. The ID is an 8-byte array.

• fixed32 flags = 16

  Flags, a bit field. Bits 0-7 (8 least significant bits) are the trace flags as defined in W3C Trace Context specification. To read the 8-bit W3C trace flag, use `flags & SPAN_FLAGS_TRACE_FLAGS_MASK`. See https://www.w3.org/TR/trace-context-2/#trace-flags for the flag definitions. Bits 8 and 9 represent the 3 states of whether a span's parent is remote. The states are (unknown, is not remote, is remote). To read whether the value is known, use `(flags & SPAN_FLAGS_CONTEXT_HAS_IS_REMOTE_MASK) != 0`. To read whether the span is remote, use `(flags & SPAN_FLAGS_CONTEXT_IS_REMOTE_MASK) != 0`. When creating span messages, if the message is logically forwarded from another source with an equivalent flags fields (i.e., usually another OTLP span message), the field SHOULD be copied as-is. If creating from a source that does not have an equivalent flags field (such as a runtime representation of an OpenTelemetry span), the high 22 bits MUST be set to zero. Readers MUST NOT assume that bits 10-31 (22 most significant bits) will be zero. [Optional].

• string name = 5

  A description of the span's operation. For example, the name can be a qualified method name or a file name and a line number where the operation is called. A best practice is to use the same display name at the same call point in an application. This makes it easier to correlate spans in different traces. This field is semantically required to be set to non-empty string. Empty value is equivalent to an unknown span name. This field is required.

• Span.SpanKind kind = 6

  Distinguishes between spans generated in a particular context. For example, two spans with the same name may be distinguished using `CLIENT` (caller) and `SERVER` (callee) to identify queueing latency associated with the span.

• fixed64 start_time_unix_nano = 7

  start_time_unix_nano is the start time of the span. On the client side, this is the time kept by the local machine where the span execution starts. On the server side, this is the time when the server's application handler starts running. Value is UNIX Epoch time in nanoseconds since 00:00:00 UTC on 1 January 1970. This field is semantically required and it is expected that end_time >= start_time.

• fixed64 end_time_unix_nano = 8

  end_time_unix_nano is the end time of the span. On the client side, this is the time kept by the local machine where the span execution ends. On the server side, this is the time when the server application handler stops running. Value is UNIX Epoch time in nanoseconds since 00:00:00 UTC on 1 January 1970. This field is semantically required and it is expected that end_time >= start_time.

• repeated KeyValue attributes = 9

  attributes 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 "example.com/myattribute": true "example.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).

• uint32 dropped_attributes_count = 10

  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.

• repeated Span.Event events = 11

  events is a collection of Event items.

• uint32 dropped_events_count = 12

  dropped_events_count is the number of dropped events. If the value is 0, then no events were dropped.

• repeated Span.Link links = 13

  links is a collection of Links, which are references from this span to a span in the same or different trace.

• uint32 dropped_links_count = 14

  dropped_links_count is the number of dropped links after the maximum size was enforced. If this value is 0, then no links were dropped.

• optional Status status = 15

  An optional final status for this span. Semantically when Status isn't set, it means span's status code is unset, i.e. assume STATUS_CODE_UNSET (code = 0).

Event is a time-stamped annotation of the span, consisting of user-supplied text description and key-value pairs.

Used in: Span

• fixed64 time_unix_nano = 1

  time_unix_nano is the time the event occurred.

• string name = 2

  name of the event. This field is semantically required to be set to non-empty string.

• repeated KeyValue attributes = 3

  attributes is a collection of attribute key/value pairs on the event. Attribute keys MUST be unique (it is not allowed to have more than one attribute with the same key).

• uint32 dropped_attributes_count = 4

  dropped_attributes_count is the number of dropped attributes. If the value is 0, then no attributes were dropped.

A pointer from the current span to another span in the same trace or in a different trace. For example, this can be used in batching operations, where a single batch handler processes multiple requests from different traces or when the handler receives a request from a different project.

Used in: Span

• 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.

• string trace_state = 3

  The trace_state associated with the link.

• repeated KeyValue attributes = 4

  attributes is a collection of attribute key/value pairs on the link. Attribute keys MUST be unique (it is not allowed to have more than one attribute with the same key).

• uint32 dropped_attributes_count = 5

  dropped_attributes_count is the number of dropped attributes. If the value is 0, then no attributes were dropped.

• fixed32 flags = 6

  Flags, a bit field. Bits 0-7 (8 least significant bits) are the trace flags as defined in W3C Trace Context specification. To read the 8-bit W3C trace flag, use `flags & SPAN_FLAGS_TRACE_FLAGS_MASK`. See https://www.w3.org/TR/trace-context-2/#trace-flags for the flag definitions. Bits 8 and 9 represent the 3 states of whether the link is remote. The states are (unknown, is not remote, is remote). To read whether the value is known, use `(flags & SPAN_FLAGS_CONTEXT_HAS_IS_REMOTE_MASK) != 0`. To read whether the link is remote, use `(flags & SPAN_FLAGS_CONTEXT_IS_REMOTE_MASK) != 0`. Readers MUST NOT assume that bits 10-31 (22 most significant bits) will be zero. When creating new spans, bits 10-31 (most-significant 22-bits) MUST be zero. [Optional].

SpanKind is the type of span. Can be used to specify additional relationships between spans in addition to a parent/child relationship.

Used in: Span

• SPAN_KIND_UNSPECIFIED = 0

  Unspecified. Do NOT use as default. Implementations MAY assume SpanKind to be INTERNAL when receiving UNSPECIFIED.

• SPAN_KIND_INTERNAL = 1

  Indicates that the span represents an internal operation within an application, as opposed to an operation happening at the boundaries. Default value.

• SPAN_KIND_SERVER = 2

  Indicates that the span covers server-side handling of an RPC or other remote network request.

• SPAN_KIND_CLIENT = 3

  Indicates that the span describes a request to some remote service.

• SPAN_KIND_PRODUCER = 4

  Indicates that the span describes a producer sending a message to a broker. Unlike CLIENT and SERVER, there is often no direct critical path latency relationship between producer and consumer spans. A PRODUCER span ends when the message was accepted by the broker while the logical processing of the message might span a much longer time.

• SPAN_KIND_CONSUMER = 5

  Indicates that the span describes consumer receiving a message from a broker. Like the PRODUCER kind, there is often no direct critical path latency relationship between producer and consumer spans.

SpanFlags represents constants used to interpret the Span.flags field, which is protobuf 'fixed32' type and is to be used as bit-fields. Each non-zero value defined in this enum is a bit-mask. To extract the bit-field, for example, use an expression like: (span.flags & SPAN_FLAGS_TRACE_FLAGS_MASK) See https://www.w3.org/TR/trace-context-2/#trace-flags for the flag definitions. Note that Span flags were introduced in version 1.1 of the OpenTelemetry protocol. Older Span producers do not set this field, consequently consumers should not rely on the absence of a particular flag bit to indicate the presence of a particular feature.

• SPAN_FLAGS_DO_NOT_USE = 0

  The zero value for the enum. Should not be used for comparisons. Instead use bitwise "and" with the appropriate mask as shown above.

• SPAN_FLAGS_TRACE_FLAGS_MASK = 255

  Bits 0-7 are used for trace flags.

• SPAN_FLAGS_CONTEXT_HAS_IS_REMOTE_MASK = 256

  Bits 8 and 9 are used to indicate that the parent span or link span is remote. Bit 8 (`HAS_IS_REMOTE`) indicates whether the value is known. Bit 9 (`IS_REMOTE`) indicates whether the span or link is remote.

• SPAN_FLAGS_CONTEXT_IS_REMOTE_MASK = 512

The Status type defines a logical error model that is suitable for different programming environments, including REST APIs and RPC APIs.

Used in: Span

• string message = 2

  A developer-facing human readable error message.

• Status.StatusCode code = 3

  The status code.

For the semantics of status codes see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/api.md#set-status

Used in: Status

• STATUS_CODE_UNSET = 0

  The default status.

• STATUS_CODE_OK = 1

  The Span has been validated by an Application developer or Operator to have completed successfully.

• STATUS_CODE_ERROR = 2

  The Span contains an error.

TracesData represents the traces data that can be stored in a persistent storage, OR can be embedded by other protocols that transfer OTLP traces 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 ResourceSpans resource_spans = 1

  An array of ResourceSpans. For data coming from a single resource this array will typically contain one element. Intermediary nodes that receive data from multiple origins typically batch the data before forwarding further and in that case this array will contain multiple elements.