Stack: Document what the usernames are for Influx and OTLP (#1636)

Got a question about this here: #1358 (comment)

Author: julienduchesne

docs/data-sources/cloud_stack.md

@@ -45,7 +45,7 @@ available at “https://<stack_slug>.grafana.net".
 - `graphite_url` (String)
 - `graphite_user_id` (Number)
 - `id` (String) The stack id assigned to this stack by Grafana.
-- `influx_url` (String) Base URL of the InfluxDB instance configured for this stack. See https://grafana.com/docs/grafana-cloud/send-data/metrics/metrics-influxdb/push-from-telegraf/ for docs on how to use this.
+- `influx_url` (String) Base URL of the InfluxDB instance configured for this stack. The username is the same as the metrics' (`prometheus_user_id` attribute of this resource). See https://grafana.com/docs/grafana-cloud/send-data/metrics/metrics-influxdb/push-from-telegraf/ for docs on how to use this.
 - `labels` (Map of String) A map of labels to assign to the stack. Label keys and values must match the following regexp: "^[a-zA-Z0-9/\\-.]+$" and stacks cannot have more than 10 labels.
 - `logs_name` (String)
 - `logs_status` (String)
@@ -55,7 +55,7 @@ available at “https://<stack_slug>.grafana.net".
 - `org_id` (Number) Organization id to assign to this stack.
 - `org_name` (String) Organization name to assign to this stack.
 - `org_slug` (String) Organization slug to assign to this stack.
-- `otlp_url` (String) Base URL of the OTLP instance configured for this stack. See https://grafana.com/docs/grafana-cloud/send-data/otlp/send-data-otlp/ for docs on how to use this.
+- `otlp_url` (String) Base URL of the OTLP instance configured for this stack. The username is the stack's ID (`id` attribute of this resource). See https://grafana.com/docs/grafana-cloud/send-data/otlp/send-data-otlp/ for docs on how to use this.
 - `profiles_name` (String)
 - `profiles_status` (String)
 - `profiles_url` (String)

docs/resources/cloud_stack.md

@@ -57,15 +57,15 @@ resource "grafana_cloud_stack" "test" {
 - `graphite_url` (String)
 - `graphite_user_id` (Number)
 - `id` (String) The stack id assigned to this stack by Grafana.
-- `influx_url` (String) Base URL of the InfluxDB instance configured for this stack. See https://grafana.com/docs/grafana-cloud/send-data/metrics/metrics-influxdb/push-from-telegraf/ for docs on how to use this.
+- `influx_url` (String) Base URL of the InfluxDB instance configured for this stack. The username is the same as the metrics' (`prometheus_user_id` attribute of this resource). See https://grafana.com/docs/grafana-cloud/send-data/metrics/metrics-influxdb/push-from-telegraf/ for docs on how to use this.
 - `logs_name` (String)
 - `logs_status` (String)
 - `logs_url` (String)
 - `logs_user_id` (Number)
 - `org_id` (Number) Organization id to assign to this stack.
 - `org_name` (String) Organization name to assign to this stack.
 - `org_slug` (String) Organization slug to assign to this stack.
-- `otlp_url` (String) Base URL of the OTLP instance configured for this stack. See https://grafana.com/docs/grafana-cloud/send-data/otlp/send-data-otlp/ for docs on how to use this.
+- `otlp_url` (String) Base URL of the OTLP instance configured for this stack. The username is the stack's ID (`id` attribute of this resource). See https://grafana.com/docs/grafana-cloud/send-data/otlp/send-data-otlp/ for docs on how to use this.
 - `profiles_name` (String)
 - `profiles_status` (String)
 - `profiles_url` (String)

internal/resources/cloud/resource_cloud_stack.go

@@ -178,8 +178,8 @@ Required access policy scopes:
 			"graphite_status":  common.ComputedString(),
 
 			// Connections
-			"influx_url": common.ComputedStringWithDescription("Base URL of the InfluxDB instance configured for this stack. See https://grafana.com/docs/grafana-cloud/send-data/metrics/metrics-influxdb/push-from-telegraf/ for docs on how to use this."),
-			"otlp_url":   common.ComputedStringWithDescription("Base URL of the OTLP instance configured for this stack. See https://grafana.com/docs/grafana-cloud/send-data/otlp/send-data-otlp/ for docs on how to use this."),
+			"influx_url": common.ComputedStringWithDescription("Base URL of the InfluxDB instance configured for this stack. The username is the same as the metrics' (`prometheus_user_id` attribute of this resource). See https://grafana.com/docs/grafana-cloud/send-data/metrics/metrics-influxdb/push-from-telegraf/ for docs on how to use this."),
+			"otlp_url":   common.ComputedStringWithDescription("Base URL of the OTLP instance configured for this stack. The username is the stack's ID (`id` attribute of this resource). See https://grafana.com/docs/grafana-cloud/send-data/otlp/send-data-otlp/ for docs on how to use this."),
 		},
 		CustomizeDiff: customdiff.All(
 			customdiff.ComputedIf("url", func(_ context.Context, diff *schema.ResourceDiff, meta interface{}) bool {