samples_per_second

[Shivali Chauhan]

Hi Team,

Do you have any idea what is the samples_per_second rate per host.

for node exporter, how many sample ingested per second per second for node exporter.

Regards,

Shivali Chauhan

[Brian Candler]

It is controlled by the prometheus server: it's whatever scrape_interval you set on the job which scrapes node_exporter.

You can do a query to find out: e.g.

count_by_time(up[5m])

will show the number of scrapes or scrape attempts in the last 5 minutes.

[yasong xu]

Error executing query: invalid parameter 'query': parse error at char 14: unknown function with name "count_by_time"

throw error, am I misunderstanding?

在 2020年3月3日星期二 UTC+8下午4:51:49，Brian Candler写道：

[Julius Volz]

You can find the number of samples for one target (e.g. one node exporter process) in multiple different ways:

a) Count the number of time series known for one target: count({instance="<node exporter instance name>"})

b) Query the synthetic metric that recorded the samples-per-scrape for each target: scrape_samples_scraped{instance="<node exporter instance name>"}

You can then calculate the samples per second for this target:

samples per second = samples per scrape / scrape interval in seconds

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[Brian Candler]

Sorry, it's count_over_time.

count_over_time(up[5m])

will show the number of attempted scrapes over 5 minutes (regardless of whether they were successful or not)

There's also a subquery variation:

count_over_time((up == 1)[5m:])