Safe Haskell	None
Language	GHC2024

Arbiter.Worker.Logger

Contents

Description

Logging for the Arbiter worker.

Arbiter handles its own structured JSON logging internally. Users can:

For application-level job logging, use ObservabilityHooks instead.

Synopsis

Log Configuration

Configuration for Arbiter's internal logging.

Arbiter always outputs structured JSON logs. This config controls filtering, destination, and allows injecting additional context.

Constructors

Fields

minLogLevel :: LogLevel
Minimum severity to emit. Messages below this level are dropped. Default: Info.
logDestination :: LogDestination
Where to write logs. Default: LogStdout.
additionalContext :: IO [Pair]
Additional context merged into every log message. This IO action is called at log time, allowing you to read thread-local state (e.g., trace IDs from an OpenTelemetry context). Default: pure [].

Where Arbiter writes log output.

Constructors

LogStdout	Log to stdout (default)
LogStderr	Log to stderr
LogFastLogger LoggerSet	Log to a custom fast-logger `LoggerSet`
LogCallback (LogLevel -> Text -> [Pair] -> IO ())	Log to a user-provided callback. The callback receives the `LogLevel`, the plain message `Text`, and all structured context as `[Pair]` (job info, additional context, etc.). This lets you integrate Arbiter's logs into your own structured logging stack. let cb level msg ctx = myLogger level msg ctx in defaultLogConfig { logDestination = LogCallback cb }
LogDiscard	Discard all logs (silent mode)

Default log configuration: Info level to stdout, no additional context.

Silent log configuration: discards all logs.

Log Levels

Log severity levels.

Constructors

Instances details

Bounded LogLevel Source #
Instance details Defined in Arbiter.Worker.Logger Methods minBound :: LogLevel # maxBound :: LogLevel #
Enum LogLevel Source #
Instance details Defined in Arbiter.Worker.Logger Methods succ :: LogLevel -> LogLevel # pred :: LogLevel -> LogLevel # toEnum :: Int -> LogLevel # fromEnum :: LogLevel -> Int # enumFrom :: LogLevel -> [LogLevel] # enumFromThen :: LogLevel -> LogLevel -> [LogLevel] # enumFromTo :: LogLevel -> LogLevel -> [LogLevel] # enumFromThenTo :: LogLevel -> LogLevel -> LogLevel -> [LogLevel] #
Read LogLevel Source #
Instance details Defined in Arbiter.Worker.Logger Methods readsPrec :: Int -> ReadS LogLevel # readList :: ReadS [LogLevel] # readPrec :: ReadPrec LogLevel # readListPrec :: ReadPrec [LogLevel] #
Show LogLevel Source #
Instance details Defined in Arbiter.Worker.Logger Methods showsPrec :: Int -> LogLevel -> ShowS # show :: LogLevel -> String # showList :: [LogLevel] -> ShowS #
Eq LogLevel Source #
Instance details Defined in Arbiter.Worker.Logger Methods (==) :: LogLevel -> LogLevel -> Bool # (/=) :: LogLevel -> LogLevel -> Bool #
Ord LogLevel Source #
Instance details Defined in Arbiter.Worker.Logger Methods compare :: LogLevel -> LogLevel -> Ordering # (<) :: LogLevel -> LogLevel -> Bool # (<=) :: LogLevel -> LogLevel -> Bool # (>) :: LogLevel -> LogLevel -> Bool # (>=) :: LogLevel -> LogLevel -> Bool # max :: LogLevel -> LogLevel -> LogLevel # min :: LogLevel -> LogLevel -> LogLevel #

type Pair = (Key, Value) #

(.=) :: (KeyValue e kv, ToJSON v) => Key -> v -> kv #