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[docs] Advice on relist interval

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This documents that the relist interval must be at least the Prometheus
scrape interval, lest metrics fade in and out.
This commit is contained in:
Solly Ross 2018-06-30 21:28:55 -04:00
parent 7b606a79fc
commit 9951568183
1 changed files with 5 additions and 1 deletions
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README.md
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@ -27,7 +27,11 @@ adapter talks to Prometheus and the main Kubernetes cluster:
in-cluster config.
- `--metrics-relist-interval=<duration>`: This is the interval at which to
update the cache of available metrics from Prometheus.
update the cache of available metrics from Prometheus. Since the adapter
only lists metrics during discovery that exist between the current time and
the last discovery query, it's necessary to set your relist interval to
*at least* your Prometheus scrape interval, otherwise your metrics will
occaisonally disappear from the adapter.
- `--prometheus-url=<url>`: This is the URL used to connect to Prometheus.
It will eventually contain query parameters to configure the connection.