Add recently_active_only to prometheus.exporter.cloudwatch discovery block

CHANGELOG.md

@@ -42,6 +42,9 @@ Main (unreleased)
 - Add support for relative paths to `import.file`. This new functionality allows users to use `import.file` blocks in modules
   imported via `import.git` and other `import.file`. (@wildum)
 
+- `prometheus.exporter.cloudwatch`: The `discovery` block now has a `recently_active_only` configuration attribute 
+  to return only metrics which have been active in the last 3 hours.
+
 ### Bugfixes
 
 - Fixed a bug in `import.git` which caused a `"non-fast-forward update"` error message. (@ptodev)

docs/sources/reference/components/prometheus/prometheus.exporter.cloudwatch.md

@@ -198,6 +198,7 @@ different `search_tags`.
 | `regions`                     | `list(string)` | List of AWS regions.                                                                                                                                                                                                                                       |         | yes      |
 | `type`                        | `string`       | CloudWatch service alias (`"alb"`, `"ec2"`, etc) or namespace name (`"AWS/EC2"`, `"AWS/S3"`, etc). Refer to [supported-services][] for a complete list.                                                                                                    |         | yes      |
 | `custom_tags`                 | `map(string)`  | Custom tags to be added as a list of key / value pairs. When exported to Prometheus format, the label name follows the following format: `custom_tag_{key}`.                                                                                               | `{}`    | no       |
+| `recently_active_only`        | `bool`         | Only return metrics that have been active in the last 3 hours.                                                                                                                                 | `false` | no       |
 | `search_tags`                 | `map(string)`  | List of key / value pairs to use for tag filtering (all must match). Value can be a regex.                                                                                                                                                                 | `{}`    | no       |
 | `dimension_name_requirements` | `list(string)` | List of metric dimensions to query. Before querying metric values, the total list of metrics will be filtered to only those that contain exactly this list of dimensions. An empty or undefined list results in all dimension combinations being included. | `{}`    | no       |
 | `nil_to_zero`                 | `bool`         | When `true`, `NaN` metric values are converted to 0. Individual metrics can override this value in the [metric][] block.                                                                                                                                   | `true`  | no       |

internal/component/prometheus/exporter/cloudwatch/config.go

@@ -56,13 +56,13 @@ type DecoupledScrapeConfig struct {
 type TagsPerNamespace = cloudwatch_exporter.TagsPerNamespace
 
 // DiscoveryJob configures a discovery job for a given service.
-// TODO: Add a recently_active_only attribute.
 type DiscoveryJob struct {
 	Auth                      RegionAndRoles `alloy:",squash"`
 	CustomTags                Tags           `alloy:"custom_tags,attr,optional"`
 	SearchTags                Tags           `alloy:"search_tags,attr,optional"`
 	Type                      string         `alloy:"type,attr"`
 	DimensionNameRequirements []string       `alloy:"dimension_name_requirements,attr,optional"`
+	RecentlyActiveOnly        bool           `alloy:"recently_active_only,attr,optional"`
 	Metrics                   []Metric       `alloy:"metric,block"`
 	//TODO: Remove NilToZero, because it is deprecated upstream.
 	NilToZero *bool `alloy:"nil_to_zero,attr,optional"`
@@ -317,8 +317,9 @@ func toYACEDiscoveryJob(rj DiscoveryJob) *yaceConf.Job {
 		DimensionNameRequirements: rj.DimensionNameRequirements,
 		// By setting RoundingPeriod to nil, the exporter will align the start and end times for retrieving CloudWatch
 		// metrics, with the smallest period in the retrieved batch.
-		RoundingPeriod: nil,
-		Metrics:        toYACEMetrics(rj.Metrics, nilToZero),
+		RoundingPeriod:     nil,
+		RecentlyActiveOnly: rj.RecentlyActiveOnly,
+		Metrics:            toYACEMetrics(rj.Metrics, nilToZero),
 	}
 	return job
 }

internal/component/prometheus/exporter/cloudwatch/config_test.go

@@ -99,6 +99,7 @@ discovery {
 		role_arn = "arn:aws:iam::878167871295:role/yace_testing"
 	}
 	dimension_name_requirements = ["BucketName"]
+	recently_active_only = true
 	metric {
 		name = "BucketSizeBytes"
 		statistics = ["Sum"]
@@ -370,6 +371,7 @@ func TestCloudwatchComponentConfig(t *testing.T) {
 						},
 						RoundingPeriod:        nil,
 						ExportedTagsOnMetrics: []string{},
+						RecentlyActiveOnly:    true,
 						DimensionsRegexps: []yaceModel.DimensionsRegexp{
 							{
 								Regexp:          regexp.MustCompile("(?P<BucketName>[^:]+)$"),