Databases61 attributes
db · cassandra · oracle · elasticsearch · pool
Client calls to SQL and NoSQL stores: the query, the operation, the collection, and the connection pool behind them.
22 metrics · 13 spans · 1 event · 35 deprecated
Domains
as of v1.44.0The conventions ship as a flat registry, but nobody arrives asking what is in the registry — they arrive asking about databases, or about HTTP. Each domain below gathers one topic's attributes, metrics and signals from both registries, and points at the part of the specification that binds them. 963 attributes, in 14 topics.
HTTP and the web62 attributes
http · url · browser · user_agent · graphql · +1
Client and server HTTP calls, the URL they address, and the browser that made them.
10 metrics · 3 spans · 3 events · 3 entities · 14 deprecated
RPC30 attributes
rpc · onc_rpc · jsonrpc · signalr
Remote procedure calls: gRPC, JSON-RPC, ONC RPC and the framework layers on top of them.
14 metrics · 10 spans · 3 events · 16 deprecated
Messaging57 attributes
messaging · cloudevents · message
Queues, topics and brokers — producing, receiving, processing and settling a message.
10 metrics · 8 spans · 5 events · 14 deprecated
Generative AI91 attributes
gen_ai · mcp · openai
Model calls, agents, tools and MCP. Split into its own repository in v1.44.0 and still unreleased.
27 metrics · 25 spans · 11 events · 11 deprecated
Cloud and serverless128 attributes
aws · gcp · faas · cloudfoundry · azure · +4
Where the code runs: the provider, the region, the account, and the function invoking it.
11 metrics · 23 spans · 3 events · 17 entities · 2 deprecated
Kubernetes and containers111 attributes
k8s · container · openshift · oci
Pods, nodes, workloads and the container runtime underneath them — the largest namespace in the registry.
191 metrics · 22 entities · 4 deprecated
Hosts and hardware94 attributes
hw · file · system · host · os · +6
The machine: its operating system, CPU, disks, filesystems and physical hardware sensors.
107 metrics · 4 entities · 7 deprecated
Network79 attributes
tls · network · net · geo · client · +5
Addresses, ports, transports and TLS — the connection every client and server span sits on.
1 metric · 17 deprecated
Runtimes and processes103 attributes
process · aspnetcore · pprof · code · jvm · +7
Processes, threads, language runtimes and the code that raised the telemetry.
126 metrics · 7 spans · 3 entities · 9 deprecated
CI/CD and source control53 attributes
vcs · cicd · artifact · deployment · test
Pipelines, repositories, test runs and the artefacts and deployments they produce.
15 metrics · 2 spans · 6 entities · 6 deprecated
Apps, devices and users54 attributes
feature_flag · app · security_rule · user · device · +4
Mobile and desktop clients: the app, the device it runs on, the session, and who is using it.
8 events · 3 entities · 8 deprecated
Errors and exceptions6 attributes
exception · error
The two namespaces every other domain reaches for when a call fails, and the rules for recording them.
1 event · 2 deprecated
Telemetry and the SDK34 attributes
otel · log · service · telemetry · event · +2
Telemetry describing itself: the service and SDK that emitted it, and the log and event plumbing.
23 metrics · 6 entities · 4 deprecated
Grouping is the one editorial judgement on this site: upstream defines the namespaces, not the topics they belong to. Every namespace the registry defines is placed in exactly one domain, and a test fails if a release adds one that is not. The flat list is still there, under Registry.