Debug logs `msg` at the debug level to the logger in `ctx`, with optional `additionalFields` structured key-value fields in the log output.

Error logs `msg` at the error level to the logger in `ctx`, with optional `additionalFields` structured key-value fields in the log output.

Info logs `msg` at the info level to the logger in `ctx`, with optional `additionalFields` structured key-value fields in the log output.

MaskAllFieldValuesRegexes returns a new context.Context that has a modified logger that masks (replaces) with asterisks (`***`) all field value substrings, matching one of the given *regexp.Regexp.

MaskAllFieldValuesStrings returns a new context.Context that has a modified logger that masks (replaces) with asterisks (`***`) all field value substrings, equal to one of the given strings.

MaskFieldValuesWithFieldKeys returns a new context.Context that has a modified logger that masks (replaces) with asterisks (`***`) any field value where the key matches one of the given keys.

MaskLogRegexes is a shortcut to invoke MaskMessageRegexes and MaskAllFieldValuesRegexes using the same input.

MaskLogStrings is a shortcut to invoke MaskMessageStrings and MaskAllFieldValuesStrings using the same input.

MaskMessageRegexes returns a new context.Context that has a modified logger that masks (replaces) with asterisks (`***`) all message substrings, matching one of the given *regexp.Regexp.

MaskMessageStrings returns a new context.Context that has a modified logger that masks (replace) with asterisks (`***`) all message substrings, equal to one of the given strings.

NewSubsystem returns a new context.Context that contains a subsystem logger configured with the passed options, named after the subsystem argument.

OmitLogWithFieldKeys returns a new context.Context that has a modified logger that will omit to write any log when any of the given keys is found within its fields.

OmitLogWithMessageRegexes returns a new context.Context that has a modified logger that will omit to write any log that has a message matching any of the given *regexp.Regexp.

OmitLogWithMessageStrings returns a new context.Context that has a modified logger that will omit to write any log that matches any of the given string.

SetField returns a new context.Context that has a modified logger in it which will include key and value as fields in all its log output.

SubsystemDebug logs `msg` at the debug level to the subsystem logger specified in `ctx`, with optional `additionalFields` structured key-value fields in the log output.

SubsystemError logs `msg` at the error level to the subsystem logger specified in `ctx`, with optional `additionalFields` structured key-value fields in the log output.

SubsystemInfo logs `msg` at the info level to the subsystem logger specified in `ctx`, with optional `additionalFields` structured key-value fields in the log output.

SubsystemMaskAllFieldValuesRegexes returns a new context.Context that has a modified logger that masks (replaces) with asterisks (`***`) all field value substrings, matching one of the given *regexp.Regexp.

SubsystemMaskAllFieldValuesStrings returns a new context.Context that has a modified logger that masks (replaces) with asterisks (`***`) all field value substrings, equal to one of the given strings.

SubsystemMaskFieldValuesWithFieldKeys returns a new context.Context that has a modified logger that masks (replaces) with asterisks (`***`) any argument value where the key matches one of the given keys.

SubsystemMaskLogRegexes is a shortcut to invoke SubsystemMaskMessageRegexes and SubsystemMaskAllFieldValuesRegexes using the same input.

SubsystemMaskLogStrings is a shortcut to invoke SubsystemMaskMessageStrings and SubsystemMaskAllFieldValuesStrings using the same input.

SubsystemMaskMessageRegexes returns a new context.Context that has a modified logger that masks (replaces) with asterisks (`***`) all message substrings, matching one of the given *regexp.Regexp.

SubsystemMaskMessageStrings returns a new context.Context that has a modified logger that masks (replace) with asterisks (`***`) all message substrings, equal to one of the given strings.

SubsystemOmitLogWithFieldKeys returns a new context.Context that has a modified logger that will omit to write any log when any of the given keys is found within its fields.

SubsystemOmitLogWithMessageRegexes returns a new context.Context that has a modified logger that will omit to write any log that has a message matching any of the given *regexp.Regexp.

SubsystemOmitLogWithMessageStrings returns a new context.Context that has a modified logger that will omit to write any log that matches any of the given string.

SubsystemSetField returns a new context.Context that has a modified logger for the specified subsystem in it which will include key and value as fields in all its log output.

SubsystemTrace logs `msg` at the trace level to the subsystem logger specified in `ctx`, with optional `additionalFields` structured key-value fields in the log output.

SubsystemWarn logs `msg` at the warn level to the subsystem logger specified in `ctx`, with optional `additionalFields` structured key-value fields in the log output.

Trace logs `msg` at the trace level to the logger in `ctx`, with optional `additionalFields` structured key-value fields in the log output.

Warn logs `msg` at the warn level to the logger in `ctx`, with optional `additionalFields` structured key-value fields in the log output.

WithAdditionalLocationOffset returns an option that allowing implementations to fix location information when implementing helper functions.

WithLevel returns an option that will set the level of the logger.

WithLevelFromEnv returns an option that will set the level of the logger based on the string in an environment variable.

WithoutLocation returns an option that disables including the location of the log line in the log output, which is on by default.

WithRootFields enables the copying of root logger fields to a new subsystem logger during creation.

Options are a collection of logging options, useful for collecting arguments to NewSubsystem prior to calling it.