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Semantic Conventions for Database Metrics

Status: Experimental

The conventions described in this section are specific to SQL and NoSQL clients.

Disclaimer: These are initial database client metric instruments and attributes but more may be added in the future.

Warning Existing database instrumentations that are using v1.24.0 of this document (or prior) SHOULD NOT change the version of the database conventions that they emit until a transition plan to the (future) stable semantic conventions has been published. Conventions include, but are not limited to, attributes, metric and span names, and unit of measure.

Database operation

Metric: db.client.operation.duration

Status: Experimental

This metric is required.

When this metric is reported alongside a database operation span, the metric value SHOULD be the same as the database operation span duration.

This metric SHOULD be specified with ExplicitBucketBoundaries of [ 0.001, 0.005, 0.01, 0.05, 0.1, 0.5, 1, 5, 10 ].

Name Instrument Type Unit (UCUM) Description Stability
db.client.operation.duration Histogram s Duration of database client operations. Experimental
Attribute Type Description Examples Requirement Level Stability
db.system string An identifier for the database management system (DBMS) product being used. See below for a list of well-known identifiers. other_sql Required Experimental
db.collection.name string The name of a collection (table, container) within the database. [1] public.users; customers Conditionally Required [2] Experimental
db.name string This attribute is used to report the name of the database being accessed. For commands that switch the database, this should be set to the target database (even if the command fails). [3] customers; main Conditionally Required If applicable. Experimental
db.operation.name string The name of the operation or command being executed. findAndModify; HMSET; SELECT Conditionally Required [4] Experimental
server.port int Server port number. [5] 80; 8080; 443 Conditionally Required [6] Stable
db.instance.id string An identifier (address, unique name, or any other identifier) of the database instance that is executing queries or mutations on the current connection. This is useful in cases where the database is running in a clustered environment and the instrumentation is able to record the node executing the query. The client may obtain this value in databases like MySQL using queries like select @@hostname. mysql-e26b99z.example.com Recommended If different from the server.address Experimental
network.peer.address string Peer address of the database node where the operation was performed. [7] 10.1.2.80; /tmp/my.sock Recommended If applicable for this database system. Stable
network.peer.port int Peer port number of the network connection. 65123 Recommended if and only if network.peer.address is set. Stable
server.address string Name of the database host. [8] example.com; 10.1.2.80; /tmp/my.sock Recommended Stable

[1]: If the collection name is parsed from the query, it SHOULD match the value provided in the query and may be qualified with the schema and database name.

[2]: If readily available. Otherwise, if the instrumentation library parses db.query.text to capture db.collection.name, then it SHOULD be the first collection name found in the query.

[3]: In some SQL databases, the database name to be used is called "schema name". In case there are multiple layers that could be considered for database name (e.g. Oracle instance name and schema name), the database name to be used is the more specific layer (e.g. Oracle schema name).

[4]: If readily available. Otherwise, if the instrumentation library parses db.query.text to capture db.operation.name, then it SHOULD be the first operation name found in the query.

[5]: When observed from the client side, and when communicating through an intermediary, server.port SHOULD represent the server port behind any intermediaries, for example proxies, if it's available.

[6]: If using a port other than the default port for this DBMS and if server.address is set.

[7]: Semantic conventions for individual database systems SHOULD document whether network.peer.* attributes are applicable. Network peer address and port are useful when the application interacts with individual database nodes directly. If a database operation involved multiple network calls (for example retries), the address of the last contacted node SHOULD be used.

[8]: When observed from the client side, and when communicating through an intermediary, server.address SHOULD represent the server address behind any intermediaries, for example proxies, if it's available.

db.system has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

Value Description Stability
other_sql Some other SQL database. Fallback only. See notes. Experimental
mssql Microsoft SQL Server Experimental
mssqlcompact Microsoft SQL Server Compact Experimental
mysql MySQL Experimental
oracle Oracle Database Experimental
db2 IBM Db2 Experimental
postgresql PostgreSQL Experimental
redshift Amazon Redshift Experimental
hive Apache Hive Experimental
cloudscape Cloudscape Experimental
hsqldb HyperSQL DataBase Experimental
progress Progress Database Experimental
maxdb SAP MaxDB Experimental
hanadb SAP HANA Experimental
ingres Ingres Experimental
firstsql FirstSQL Experimental
edb EnterpriseDB Experimental
cache InterSystems Caché Experimental
adabas Adabas (Adaptable Database System) Experimental
firebird Firebird Experimental
derby Apache Derby Experimental
filemaker FileMaker Experimental
informix Informix Experimental
instantdb InstantDB Experimental
interbase InterBase Experimental
mariadb MariaDB Experimental
netezza Netezza Experimental
pervasive Pervasive PSQL Experimental
pointbase PointBase Experimental
sqlite SQLite Experimental
sybase Sybase Experimental
teradata Teradata Experimental
vertica Vertica Experimental
h2 H2 Experimental
coldfusion ColdFusion IMQ Experimental
cassandra Apache Cassandra Experimental
hbase Apache HBase Experimental
mongodb MongoDB Experimental
redis Redis Experimental
couchbase Couchbase Experimental
couchdb CouchDB Experimental
cosmosdb Microsoft Azure Cosmos DB Experimental
dynamodb Amazon DynamoDB Experimental
neo4j Neo4j Experimental
geode Apache Geode Experimental
elasticsearch Elasticsearch Experimental
memcached Memcached Experimental
cockroachdb CockroachDB Experimental
opensearch OpenSearch Experimental
clickhouse ClickHouse Experimental
spanner Cloud Spanner Experimental
trino Trino Experimental

Connection pools

The following metric instruments describe database client connection pool operations.

Metric: db.client.connections.usage

This metric is required.

Name Instrument Type Unit (UCUM) Description Stability
db.client.connections.usage UpDownCounter {connection} The number of connections that are currently in state described by the state attribute Experimental
Attribute Type Description Examples Requirement Level Stability
db.client.connections.pool.name string The name of the connection pool; unique within the instrumented application. In case the connection pool implementation doesn't provide a name, instrumentation should use a combination of server.address and server.port attributes formatted as server.address:server.port. myDataSource Required Experimental
db.client.connections.state string The state of a connection in the pool idle Required Experimental

db.client.connections.state has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

Value Description Stability
idle idle Experimental
used used Experimental

Metric: db.client.connections.idle.max

This metric is recommended.

Name Instrument Type Unit (UCUM) Description Stability
db.client.connections.idle.max UpDownCounter {connection} The maximum number of idle open connections allowed Experimental
Attribute Type Description Examples Requirement Level Stability
db.client.connections.pool.name string The name of the connection pool; unique within the instrumented application. In case the connection pool implementation doesn't provide a name, instrumentation should use a combination of server.address and server.port attributes formatted as server.address:server.port. myDataSource Required Experimental

Metric: db.client.connections.idle.min

This metric is recommended.

Name Instrument Type Unit (UCUM) Description Stability
db.client.connections.idle.min UpDownCounter {connection} The minimum number of idle open connections allowed Experimental
Attribute Type Description Examples Requirement Level Stability
db.client.connections.pool.name string The name of the connection pool; unique within the instrumented application. In case the connection pool implementation doesn't provide a name, instrumentation should use a combination of server.address and server.port attributes formatted as server.address:server.port. myDataSource Required Experimental

Metric: db.client.connections.max

This metric is recommended.

Name Instrument Type Unit (UCUM) Description Stability
db.client.connections.max UpDownCounter {connection} The maximum number of open connections allowed Experimental
Attribute Type Description Examples Requirement Level Stability
db.client.connections.pool.name string The name of the connection pool; unique within the instrumented application. In case the connection pool implementation doesn't provide a name, instrumentation should use a combination of server.address and server.port attributes formatted as server.address:server.port. myDataSource Required Experimental

Metric: db.client.connections.pending_requests

This metric is recommended.

Name Instrument Type Unit (UCUM) Description Stability
db.client.connections.pending_requests UpDownCounter {request} The number of pending requests for an open connection, cumulative for the entire pool Experimental
Attribute Type Description Examples Requirement Level Stability
db.client.connections.pool.name string The name of the connection pool; unique within the instrumented application. In case the connection pool implementation doesn't provide a name, instrumentation should use a combination of server.address and server.port attributes formatted as server.address:server.port. myDataSource Required Experimental

Metric: db.client.connections.timeouts

This metric is recommended.

Name Instrument Type Unit (UCUM) Description Stability
db.client.connections.timeouts Counter {timeout} The number of connection timeouts that have occurred trying to obtain a connection from the pool Experimental
Attribute Type Description Examples Requirement Level Stability
db.client.connections.pool.name string The name of the connection pool; unique within the instrumented application. In case the connection pool implementation doesn't provide a name, instrumentation should use a combination of server.address and server.port attributes formatted as server.address:server.port. myDataSource Required Experimental

Metric: db.client.connections.create_time

This metric is recommended.

Name Instrument Type Unit (UCUM) Description Stability
db.client.connections.create_time Histogram ms The time it took to create a new connection Experimental
Attribute Type Description Examples Requirement Level Stability
db.client.connections.pool.name string The name of the connection pool; unique within the instrumented application. In case the connection pool implementation doesn't provide a name, instrumentation should use a combination of server.address and server.port attributes formatted as server.address:server.port. myDataSource Required Experimental

Metric: db.client.connections.wait_time

This metric is recommended.

Name Instrument Type Unit (UCUM) Description Stability
db.client.connections.wait_time Histogram ms The time it took to obtain an open connection from the pool Experimental
Attribute Type Description Examples Requirement Level Stability
db.client.connections.pool.name string The name of the connection pool; unique within the instrumented application. In case the connection pool implementation doesn't provide a name, instrumentation should use a combination of server.address and server.port attributes formatted as server.address:server.port. myDataSource Required Experimental

Metric: db.client.connections.use_time

This metric is recommended.

Name Instrument Type Unit (UCUM) Description Stability
db.client.connections.use_time Histogram ms The time between borrowing a connection and returning it to the pool Experimental
Attribute Type Description Examples Requirement Level Stability
db.client.connections.pool.name string The name of the connection pool; unique within the instrumented application. In case the connection pool implementation doesn't provide a name, instrumentation should use a combination of server.address and server.port attributes formatted as server.address:server.port. myDataSource Required Experimental