Logger is a middleware for logging begin and end messages.

Metrics is a middleware to make count and duration report Prometheus-specific implementation: The "_total" suffix is appended to the counter name, defined in "counterSuffix", see: https://github.com/open-telemetry/opentelemetry-go/blob/main/exporters/prometheus/exporter.go#L100 The unit "s" is appended as "_seconds" to the metric name (injected before the "_total" suffix), defined in "unitSuffixes", see https://github.com/open-telemetry/opentelemetry-go/blob/main/exporters/prometheus/exporter.go#L343 */.

SemAcquire is a middleware to acquire semaphore.

Span is a middleware to start/end a new span, using from context.

TryCatch is a middleware for catching Go panic and propagating it as an error.

ErrPanic is an error for captured panic.

ErrTypeCast is an error for type assertion from interface.