Add Sampling for Logs (#151)

Author: AntoxaAntoxic

src/main/java/org/prebid/cache/handlers/cache/CacheHandler.java

@@ -70,14 +70,12 @@ Mono<ServerResponse> finalizeResult(final Mono<ServerResponse> mono,
     private Mono<ServerResponse> handleErrorMetrics(final Throwable error, final ServerRequest request) {
         if (error instanceof RepositoryException) {
             recordMetric(MeasurementTag.ERROR_DB);
-        } else if (error instanceof ResourceNotFoundException) {
+        } else if (error instanceof ResourceNotFoundException || error instanceof BadRequestException) {
             conditionalLogger.info(
                     error.getMessage()
                             + ". Refererring URLs: " + request.headers().header(HttpHeaders.REFERER)
                             + ". Request URI: " + request.uri(),
                     samplingRate);
-        } else if (error instanceof BadRequestException) {
-            log.error(error.getMessage());
         } else if (error instanceof TimeoutException) {
             metricsRecorder.markMeterForTag(this.metricTagPrefix, MeasurementTag.ERROR_TIMED_OUT);
         } else if (error instanceof DataBufferLimitException) {
@@ -86,8 +84,9 @@ private Mono<ServerResponse> handleErrorMetrics(final Throwable error, final Ser
                     "Request length: `" + contentLength + "` exceeds maximum size limit",
                     samplingRate);
         } else {
-            log.error("Error occurred while processing the request: '{}', cause: '{}'",
-                    ExceptionUtils.getMessage(error), ExceptionUtils.getMessage(error));
+            conditionalLogger.error("Error occurred while processing the request: '%s', cause: '%s'".formatted(
+                    ExceptionUtils.getMessage(error), ExceptionUtils.getMessage(error)),
+                    samplingRate);
         }
 
         return builder.error(Mono.just(error), request)