v0.3.0

Added

• db.client.response.affected_rows histogram – a custom metric (no OTel semconv equivalent) mirroring the existing db.response.affected_rows span attribute. Recorded on execute() calls; carries the same connection / annotation / error attribute set as the duration histogram so dashboards can slice mutation throughput by the same dimensions (#33).
• PoolBuilder::with_network_protocol_name and with_network_transport builder methods, plus a per-backend Database::DEFAULT_NETWORK_PROTOCOL_NAME constant (Postgres → "postgresql", MySQL → "mysql", SQLite → None). network.protocol.name, network.transport, and db.client.connection.pool.name now surface on every span and per-operation metric data point so dashboards can slice query latency by the same dimensions OTel's database-spans semconv recommends (#32).

Changed

• db.client.connection.pool.name previously appeared only on the db.client.connection.count gauge; it now also propagates to spans, the db.client.operation.duration / db.client.response.returned_rows histograms, and the rest of the db.client.connection.* family via the shared connection-attribute set. The count gauge's attribute set is unchanged (#32).
• db.query.text now collapses inter-token whitespace runs to a single space and trims leading/trailing whitespace for both QueryTextMode::Full (default) and QueryTextMode::Obfuscated. Whitespace inside string literals, quoted identifiers, dollar-quoted bodies, and comments is preserved verbatim. Multi-line SQL written for source-level readability now renders as a single readable line in OTel exports without the embedded \n and indentation runs that came from source-level formatting. QueryTextMode::Off is unchanged (#34).

Fixed

• Query-side with_annotations / with_operation now compile inside Send-required async contexts (axum handlers, tokio::spawn, tower::Service-bounded futures). The AnnotatedQuery::fetch_* / execute forwarders were rewritten from async fn into fn -> impl Future + Send + 'e, so the HRTB carried by the internal IntoAnnotatedExecutor impls no longer leaks into auto-trait inference of an opaque coroutine. Span output is byte-identical to the executor-side surface; metrics emission is unchanged by construction because both surfaces continue to funnel through the same Annotated<'_, Pool<DB>> Executor impl (#31).
• db.client.operation.duration histogram now carries annotation-derived attributes (db.operation.name, db.collection.name, db.query.summary, db.stored_procedure.name) and error-path attributes (error.type, plus db.response.status_code for sqlx::Error::Database). Previously only connection-level attributes (db.system.name, db.namespace) reached the histogram, so dashboards could not slice DB latency by operation verb, target collection, or error class. The InstrumentedStream poll loop also gains a single-error latch so streams that yield multiple Err items before terminating cannot append duplicate error.type / db.response.status_code keys (#32).

v0.2.0

Added

• Query-side with_annotations / with_operation via the new QueryAnnotateExt trait on sqlx::query, sqlx::query_as, and sqlx::query_scalar, so per-query attributes can sit next to the query text. bind and with_annotations compose in either order (#22).
• Query::map / Query::try_map chains and the sqlx::query!() / query_as!() / query_scalar!() macros now support with_annotations / with_operation. On hand-written chains the annotation may sit before bind, between bind and map, or after map; macro queries carry annotations after the macro returns (#23).

Changed

• BREAKING: Sealed the Database trait. Only sqlx::Sqlite, sqlx::Postgres, and sqlx::MySql can implement it; downstream crates cannot. In practice the trait was already constrained to these three backends because it requires an upstream sqlx::Database impl, but the bound is now enforced at the type level (#25).

v0.1.0

Added

• Span name follows the OpenTelemetry Database Spans § Name hierarchy in full: db.query.summary (set via QueryAnnotations::query_summary()) takes precedence over the {operation} {collection} synthesis (#18).
• Obfuscation mode for db.query.text: QueryTextMode::Obfuscated now replaces string, numeric, hex, boolean, and dollar-quoted literals with ? while preserving comments, identifiers, operators, and NULL (#16).
• Per-query annotation API for the semantic convention attributes the library cannot derive from SQL: db.operation.name, db.collection.name, db.query.summary, db.stored_procedure.name (#15).
• db.response.affected_rows recorded on execute() spans (#13).
• Connection pool metrics (db.client.connection.count, db.client.connection.idle.max, etc.) with a runtime abstraction over tokio and async-std (#12).
• MySQL backend (#6).
• PostgreSQL backend (#4).
• SQLite backend (#3).
• Backend-agnostic instrumentation core: Pool, PoolBuilder, Transaction, PoolConnection, and the Executor trait wiring that emits OpenTelemetry-native spans and metrics following the database calls and systems semantic conventions (#2).