metrics-core/src/main/java/software/amazon/swage/metrics/record/cloudwatch/CloudWatchRecorder.java [391:401]:
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            final RecorderContext context)
    {
        if (!running.get()) {
            log.debug("record called on shutdown recorder");
            //TODO: something besides silently ignore, perhaps IllegalStateException?
            return;
        }

        if (!isValid(label)) {
            log.warn("Invalid metric name: '" + label + "'");
            return;
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metrics-core/src/main/java/software/amazon/swage/metrics/record/file/FileRecorder.java [136:146]:
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            final RecorderContext context)
    {
        if (!running.get()) {
            log.debug("record called on shutdown recorder");
            //TODO: something besides silently ignore?
            return;
        }

        if (!isValid(label)) {
            log.warn("Invalid metric name: '" + label + "'");
            return;
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