Increase default interval to 10 minutes (#43)

Currently the scrape interval is 1 minute. As the metrics we are tracking are
rather slow moving we can accept a delay of up to 10 minutes for changes to be
reflected. This reduces the load in Snyk APIs significantly and also reduces
resource usage of the exporter (as it does the scraping 10 times less).

README.md

@@ -37,21 +37,22 @@ usage: snyk_exporter --snyk.api-token=SNYK.API-TOKEN [<flags>]
 Snyk exporter for Prometheus. Provide your Snyk API token and the organization(s) to scrape to expose Prometheus metrics.
 
 Flags:
-  -h, --help              Show context-sensitive help (also try --help-long and --help-man).
+  -h, --help               Show context-sensitive help (also try --help-long and --help-man).
       --snyk.api-url="https://snyk.io/api/v1"
-                          Snyk API URL
+                           Snyk API URL
       --snyk.api-token=SNYK.API-TOKEN
-                          Snyk API token
-  -i, --snyk.interval=60  Polling interval for requesting data from Snyk API in seconds
+                           Snyk API token
+  -i, --snyk.interval=600  Polling interval for requesting data from Snyk API in seconds
       --snyk.organization=SNYK.ORGANIZATION ...
-                          Snyk organization ID to scrape projects from (can be repeated for multiple organizations)
-      --snyk.timeout=10   Timeout for requests against Snyk API
+                           Snyk organization ID to scrape projects from (can be repeated for multiple organizations)
+      --snyk.timeout=10    Timeout for requests against Snyk API
       --web.listen-address=":9532"
-                          Address on which to expose metrics.
-      --log.level="info"  Only log messages with the given severity or above. Valid levels: [debug, info, warn, error, fatal]
+                           Address on which to expose metrics.
+      --log.level="info"   Only log messages with the given severity or above. Valid levels: [debug, info, warn, error, fatal]
       --log.format="logger:stderr"
-                          Set the log target and format. Example: "logger:syslog?appname=bob&local=7" or "logger:stdout?json=true"
-      --version           Show application version.
+                           Set the log target and format. Example: "logger:syslog?appname=bob&local=7" or "logger:stdout?json=true"
+      --version            Show application version.
+
 ```
 
 It is possible to use a file to pass arguments to the exporter.
@@ -66,7 +67,7 @@ And run the exporter using:
 
 # Design
 
-The exporter starts a long-running go routine on startup that scrapes the Snyk API with a fixed interval (default every `60` seconds).
+The exporter starts a long-running go routine on startup that scrapes the Snyk API with a fixed interval (default every `10` minutes).
 The interval can be configured as needed.
 
 The API results are aggregated and recorded on the `snyk_vulnerabiilities_total` metric with the following labels:

main.go

@@ -52,7 +52,7 @@ func main() {
 	flags := kingpin.New("snyk_exporter", "Snyk exporter for Prometheus. Provide your Snyk API token and the organization(s) to scrape to expose Prometheus metrics.")
 	snykAPIURL := flags.Flag("snyk.api-url", "Snyk API URL").Default("https://snyk.io/api/v1").String()
 	snykAPIToken := flags.Flag("snyk.api-token", "Snyk API token").Required().String()
-	snykInterval := flags.Flag("snyk.interval", "Polling interval for requesting data from Snyk API in seconds").Short('i').Default("60").Int()
+	snykInterval := flags.Flag("snyk.interval", "Polling interval for requesting data from Snyk API in seconds").Short('i').Default("600").Int()
 	snykOrganizations := flags.Flag("snyk.organization", "Snyk organization ID to scrape projects from (can be repeated for multiple organizations)").Strings()
 	requestTimeout := flags.Flag("snyk.timeout", "Timeout for requests against Snyk API").Default("10").Int()
 	listenAddress := flags.Flag("web.listen-address", "Address on which to expose metrics.").Default(":9532").String()