dentaku/netatmo-exporter
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Update readme for cached data

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Robert Jacob 2020-06-27 18:09:04 +02:00
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19
README.md
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@ -40,11 +40,14 @@ This application tries to get data from the NetAtmo API. For that to work you wi
```plain
$ netatmo-exporter --help
Usage of netatmo-exporter:
-a, --addr string Address to listen on. (default ":9210")
-i, --client-id string Client ID for NetAtmo app.
-s, --client-secret string Client secret for NetAtmo app.
-p, --password string Password of NetAtmo account.
-u, --username string Username of NetAtmo account.
-a, --addr string Address to listen on. (default ":9210")
--age-stale duration Data age to consider as stale. Stale data does not create metrics anymore. (default 30m0s)
-i, --client-id string Client ID for NetAtmo app.
-s, --client-secret string Client secret for NetAtmo app.
--log-level level Sets the minimum level output through logging. (default info)
-p, --password string Password of NetAtmo account.
--refresh-interval duration Time interval used for internal caching of NetAtmo sensor data. (default 8m0s)
-u, --username string Username of NetAtmo account.
```
After starting the server will offer the metrics on the `/metrics` endpoint, which can be used as a target for prometheus.
@ -59,9 +62,11 @@ You can pass credentials either via command line arguments (see next section) or
* `NETATMO_CLIENT_USERNAME` Username of NetAtmo account
* `NETATMO_CLIENT_PASSWORD` Password of NetAtmo account
### Scrape interval
### Cached data
The exporter will query the Netatmo API every time it is scraped by prometheus. It does not make sense to scrape the Netatmo API with a small interval as the sensors only update their data every few minutes, so don't forget to set a slower scrape interval for this exporter:
The exporter has an in-memory cache for the data retrieved from the Netatmo API. The purpose of this is to decouple making requests to the Netatmo API from the scraping interval as the data from Netatmo does not update nearly as fast as the default scrape interval of Prometheus. Per the Netatmo documentation the sensor data is updated every ten minutes. The default "refresh interval" of the exporter is set a bit below this (8 minutes), but still much higher than the default Prometheus scrape interval (15 seconds).
You can still set a slower scrape interval for this exporter if you like:
```yml
scrape_configs: