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Allow help text to be customized (#87)
* Updated mappings to accept custom help text in YAML config * Updated exporter to display configured help messages * Update README to reflect aditional configurability * Removed inaccurate comment * Removed some cruft from a rebase
This commit is contained in:
Dave Rawks
Tobias Schmidt
parent
9accf494a9
commit
ab2a88c06f
3 changed files with 33 additions and 8 deletions
11
README.md
11
README.md
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@ -128,6 +128,17 @@ follows:
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=> test_web__server_foo_bar{}
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If the default metric help text is insufficient for your needs you may use the YAML
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configuration to specify a custom help text for each mapping:
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```yaml
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mappings:
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- match: http.request.*
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help: "Total number of http requests"
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labels:
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name: "http_requests_total"
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code: "$1"
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```
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In the configuration, one may also set the timer type to "histogram". The
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default is "summary" as in the plain text configuration format. For example,
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to set the timer type for a single metric:
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29
exporter.go
29
exporter.go
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@ -71,13 +71,13 @@ func NewCounterContainer() *CounterContainer {
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}
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}
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func (c *CounterContainer) Get(metricName string, labels prometheus.Labels) (prometheus.Counter, error) {
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func (c *CounterContainer) Get(metricName string, labels prometheus.Labels, help string) (prometheus.Counter, error) {
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hash := hashNameAndLabels(metricName, labels)
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counter, ok := c.Elements[hash]
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if !ok {
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counter = prometheus.NewCounter(prometheus.CounterOpts{
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Name: metricName,
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Help: defaultHelp,
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Help: help,
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ConstLabels: labels,
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})
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if err := prometheus.Register(counter); err != nil {
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@ -98,13 +98,13 @@ func NewGaugeContainer() *GaugeContainer {
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}
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}
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func (c *GaugeContainer) Get(metricName string, labels prometheus.Labels) (prometheus.Gauge, error) {
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func (c *GaugeContainer) Get(metricName string, labels prometheus.Labels, help string) (prometheus.Gauge, error) {
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hash := hashNameAndLabels(metricName, labels)
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gauge, ok := c.Elements[hash]
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if !ok {
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gauge = prometheus.NewGauge(prometheus.GaugeOpts{
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Name: metricName,
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Help: defaultHelp,
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Help: help,
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ConstLabels: labels,
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})
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if err := prometheus.Register(gauge); err != nil {
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@ -125,14 +125,14 @@ func NewSummaryContainer() *SummaryContainer {
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}
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}
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func (c *SummaryContainer) Get(metricName string, labels prometheus.Labels) (prometheus.Summary, error) {
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func (c *SummaryContainer) Get(metricName string, labels prometheus.Labels, help string) (prometheus.Summary, error) {
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hash := hashNameAndLabels(metricName, labels)
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summary, ok := c.Elements[hash]
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if !ok {
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summary = prometheus.NewSummary(
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prometheus.SummaryOpts{
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Name: metricName,
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Help: defaultHelp,
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Help: help,
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ConstLabels: labels,
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})
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if err := prometheus.Register(summary); err != nil {
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@ -155,7 +155,7 @@ func NewHistogramContainer(mapper *metricMapper) *HistogramContainer {
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}
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}
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func (c *HistogramContainer) Get(metricName string, labels prometheus.Labels, mapping *metricMapping) (prometheus.Histogram, error) {
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func (c *HistogramContainer) Get(metricName string, labels prometheus.Labels, help string, mapping *metricMapping) (prometheus.Histogram, error) {
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hash := hashNameAndLabels(metricName, labels)
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histogram, ok := c.Elements[hash]
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if !ok {
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@ -166,7 +166,7 @@ func (c *HistogramContainer) Get(metricName string, labels prometheus.Labels, ma
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histogram = prometheus.NewHistogram(
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prometheus.HistogramOpts{
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Name: metricName,
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Help: defaultHelp,
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Help: help,
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ConstLabels: labels,
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Buckets: buckets,
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})
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@ -244,10 +244,19 @@ func (b *Exporter) Listen(e <-chan Events) {
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return
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}
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for _, event := range events {
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var help string
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metricName := ""
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prometheusLabels := event.Labels()
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mapping, labels, present := b.mapper.getMapping(event.MetricName())
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if mapping == nil {
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mapping = &metricMapping{}
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}
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if mapping.HelpText == "" {
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help = defaultHelp
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} else {
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help = mapping.HelpText
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}
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if present {
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metricName = labels["name"]
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for label, value := range labels {
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@ -273,6 +282,7 @@ func (b *Exporter) Listen(e <-chan Events) {
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counter, err := b.Counters.Get(
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metricName,
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prometheusLabels,
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help,
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)
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if err == nil {
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counter.Add(event.Value())
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@ -287,6 +297,7 @@ func (b *Exporter) Listen(e <-chan Events) {
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gauge, err := b.Gauges.Get(
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metricName,
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prometheusLabels,
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help,
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)
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if err == nil {
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@ -316,6 +327,7 @@ func (b *Exporter) Listen(e <-chan Events) {
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histogram, err := b.Histograms.Get(
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metricName,
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prometheusLabels,
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help,
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mapping,
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)
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if err == nil {
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@ -330,6 +342,7 @@ func (b *Exporter) Listen(e <-chan Events) {
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summary, err := b.Summaries.Get(
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metricName,
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prometheusLabels,
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help,
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)
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if err == nil {
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summary.Observe(event.Value())
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@ -52,6 +52,7 @@ type metricMapping struct {
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TimerType timerType `yaml:"timer_type"`
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Buckets []float64 `yaml:"buckets"`
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MatchType matchType `yaml:"match_type"`
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HelpText string `yaml:"help"`
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}
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func (m *metricMapper) initFromYAMLString(fileContents string) error {
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