chore(logging): allow mixins to be provided to observability.getLogger (#1971)

packages/shared/src/observability/index.ts

@@ -3,8 +3,13 @@ import type { LoggerOptions } from 'pino'
 import { toClef, clefLevels } from './pinoClef'
 
 let logger: pino.Logger
+type MixinFn = (mergeObject: object, level: number) => object
 
-export function getLogger(logLevel = 'info', pretty = false): pino.Logger {
+export function getLogger(
+  logLevel = 'info',
+  pretty = false,
+  mixin?: MixinFn
+): pino.Logger {
   if (logger) return logger
 
   const pinoOptions: LoggerOptions = {
@@ -22,6 +27,7 @@ export function getLogger(logLevel = 'info', pretty = false): pino.Logger {
             },
       log: (logObject) => (pretty ? logObject : toClef(logObject))
     },
+    mixin,
     // when not pretty, to produce a clef format, we need the message to be the message template key
     messageKey: pretty ? 'msg' : '@mt',
     level: logLevel,