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Fix NPE when label value is null #1265

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Fix NPE when label value is null #1265

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3 changes: 3 additions & 0 deletions ...ion-textformats/src/main/java/io/prometheus/metrics/expositionformats/TextFormatUtil.java
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Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,9 @@ static void writeTimestamp(Writer writer, long timestampMs) throws IOException {
}

static void writeEscapedLabelValue(Writer writer, String s) throws IOException {
if (s == null) {
return;
}
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
switch (c) {
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