On Sunday, 2 January 2022 at 03:05:16 UTC ee1 wrote: > 1 - With this client, is it possible, and is anyone aware of a simple > example, of only executing the metric-generating function when a scrape > comes in from prometheus,? >
Yes: for a gauge, you can register a callback function. The function will be triggered on a scrape. https://github.com/prometheus/client_python#gauge Another way is using Custom Collectors: https://github.com/prometheus/client_python#custom-collectors (Obviously for counters, you need to increment or accumulate the counter whenever the metric-generating event happens - otherwise you wouldn't know the total value when the scrape occurs) > > I notice that the HTTP server included ignores the URI of the request and > returns the metrics regardless. e.g. This works just fine: > http://localhost:8000/foo?doesntmatter=anything > > 2 - Similarly is it possible/available Python example, of using the > included HTTP server but parsing HTTP parameters that come in from > prometheus in order to write a multi-target exporter like described here > <https://prometheus.io/docs/guides/multi-target-exporter/>? > > Bolt it onto your own http.server <https://docs.python.org/3/library/http.server.html> instead. See the docs here: https://github.com/prometheus/client_python#http "To add Prometheus exposition to an existing HTTP server, see the MetricsHandler <https://github.com/prometheus/client_python/blob/v0.12.0/prometheus_client/exposition.py#L229-L247> class which provides a BaseHTTPRequestHandler. It also serves as a simple example of how to write a custom endpoint." -- You received this message because you are subscribed to the Google Groups "Prometheus Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-users/869e8b4a-982c-43f2-ad9f-6247bb1ce259n%40googlegroups.com.
