The Schema URL, if known. This is the identifier of the Schema that the metric 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 metrics in the "metrics" field.
Generated from protobuf field <code>string schema_url = 3;</code>
Type: schema_url
File
vendor/open-telemetry/gen-otlp-protobuf/Opentelemetry/Proto/Metrics/V1/ScopeMetrics.php, line 40