config: add commented values for advanced config flags

configs/nri-prometheus-config.yml.sample

@@ -32,6 +32,14 @@ integrations:
       # Length in time to distribute the scraping from the endpoints.
       scrape_duration: "5s"
 
+      # Number of worker threads used for scraping targets.
+      # For large clusters with many (>400) endpoints, slowly increase until scrape
+      # time falls between the desired `scrape_duration`.
+      # Increasing this value too much will result in huge memory consumption if too
+      # many metrics are being scraped.
+      # Default: 4
+      # worker_threads: 4
+
       # Whether the integration should skip TLS verification or not. Defaults to false.
       insecure_skip_verify: false
 

deploy/nri-prometheus.tmpl.yaml

@@ -117,6 +117,22 @@ data:
     # Whether k8s nodes need to be labelled to be scraped or not. Defaults to true.
     require_scrape_enabled_label_for_nodes: true
 
+    # Number of worker threads used for scraping targets.
+    # For large clusters with many (>400) endpoints, slowly increase until scrape
+    # time falls between the desired `scrape_duration`.
+    # Increasing this value too much will result in huge memory consumption if too
+    # many metrics are being scraped.
+    # Default: 4
+    # worker_threads: 4
+
+    # Maximum number of metrics to keep in memory until a report is triggered.
+    # Changing this value is not recommended unless instructed by the New Relic support team.
+    # max_stored_metrics: 10000
+
+    # Minimum amount of time to wait between reports. Cannot be lowered than the default, 200ms.
+    # Changing this value is not recommended unless instructed by the New Relic support team.
+    # min_emitter_harvest_period: 200ms
+
     # targets:
     #   - description: Secure etcd example
     #     urls: ["https://192.168.3.1:2379", "https://192.168.3.2:2379", "https://192.168.3.3:2379"]