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Add comments explaining escapeMetricName

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Signed-off-by: Brian Akins <brian@akins.org>
This commit is contained in:
Brian Akins 2019-04-09 14:10:26 -04:00
parent 7f70979120
commit cfcf3c9ba5
1 changed files with 4 additions and 0 deletions
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4
exporter.go
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@ -288,6 +288,10 @@ func escapeMetricName(metricName string) string {
out := make([]byte, len(metricName)) out := make([]byte, len(metricName))
j := 0 j := 0
for _, c := range metricName { for _, c := range metricName {
// check if the rune is valid for a metric name
// and replace it if it is not.
// As only certain ASCII characters are valid in metric names,
// we can use a byte.
if (c >= 'a' && c <= 'z') || if (c >= 'a' && c <= 'z') ||
(c >= 'A' && c <= 'Z') || (c >= 'A' && c <= 'Z') ||
(c >= '0' && c <= '9') { (c >= '0' && c <= '9') {