Service Attributes

A service instance.

service.instance.idstringThe string ID of the service instance. [1]627cc493-f310-47de-96bd-71410b7dec09Experimental
service.namestringLogical name of the service. [2]shoppingcartStable
service.namespacestringA namespace for [3]ShopExperimental
service.versionstringThe version string of the service API or implementation. The format is not defined by these conventions.2.0.0; a01dbef8aStable

[1]: MUST be unique for each instance of the same service.namespace, pair (in other words service.namespace,, triplet MUST be globally unique). The ID helps to distinguish instances of the same service that exist at the same time (e.g. instances of a horizontally scaled service).

Implementations, such as SDKs, are recommended to generate a random Version 1 or Version 4 RFC 4122 UUID, but are free to use an inherent unique ID as the source of this value if stability is desirable. In that case, the ID SHOULD be used as source of a UUID Version 5 and SHOULD use the following UUID as the namespace: 4d63009a-8d0f-11ee-aad7-4c796ed8e320.

UUIDs are typically recommended, as only an opaque value for the purposes of identifying a service instance is needed. Similar to what can be seen in the man page for the /etc/machine-id file, the underlying data, such as pod name and namespace should be treated as confidential, being the user’s choice to expose it or not via another resource attribute.

For applications running behind an application server (like unicorn), we do not recommend using one identifier for all processes participating in the application. Instead, it’s recommended each division (e.g. a worker thread in unicorn) to have its own

It’s not recommended for a Collector to set if it can’t unambiguously determine the service instance that is generating that telemetry. For instance, creating an UUID based on will likely be wrong, as the Collector might not know from which container within that pod the telemetry originated. However, Collectors can set the if they can unambiguously determine the service instance for that telemetry. This is typically the case for scraping receivers, as they know the target address and port.

[2]: MUST be the same for all instances of horizontally scaled services. If the value was not specified, SDKs MUST fallback to unknown_service: concatenated with, e.g. unknown_service:bash. If is not available, the value MUST be set to unknown_service.

[3]: A string value having a meaning that helps to distinguish a group of services, for example the team name that owns a group of services. is expected to be unique within the same namespace. If service.namespace is not specified in the Resource then is expected to be unique for all services that have no explicit namespace defined (so the empty/unspecified namespace is simply one more valid namespace). Zero-length namespace string is assumed equal to unspecified namespace.