Attributed metrics module and skeleton (#6887)

Task/Issue URL:
https://app.asana.com/1/137249556945/project/1202552961248957/task/1211500171306010?focus=true

### Description
Scope
- Create attributed-metrics module
- Add database to store events
- Connect with FF: enable/disable client
- Connect with Atb, privacy config
- Handles initialization and returning users checks
- Handles expiry date to disable client

### Steps to test this PR

While testing this PR you need to add the following in your logcat
filter:
`tag~:"AttributedMetrics"`

_Feature 1_
- [x] We need fresh install (including removing DDG folder in file
system)
- [x] open the app
- [x] wait for privacy config download, since we need atb init
- [x] Detected new install not reinstall Log: `New install detected,
attributed metrics active`
- [x] Log: `Client status running: true...`
- [x] Skip onboarding and go to browser 
- [x] Access feature flag inventory
- [x] Disable `attributedMetrics` FF
- [x] restart the app
- [x] See in the log `Privacy config downloaded, attributed metrics
enabled: false` (that should disable the client)
- [x] and log `Client status running: false -> isActive: true,
isEnabled: false...`

_Feature 2_
- [x] fresh install but keep DDG folder
- [x] open the app
- [x] wait for privacy config download, since we need atb init
- [x] check logs for `App reinstall detected, attributed metrics will
not be active`
- [x] and `Client status running: false -> isActive: false, isEnabled:
true...`

### UI changes
| Before  | After |
| ------ | ----- |
!(Upload before screenshot)|(Upload after screenshot)|

Author: cmonfortep

ad-click/ad-click-impl/build.gradle

@@ -48,6 +48,7 @@ dependencies {
     implementation project(path: ':privacy-config-api')
     implementation project(path: ':feature-toggles-api')
     implementation project(path: ':app-build-config-api')
+    implementation project(path: ':attributed-metrics-api')
 
     implementation AndroidX.core.ktx
 
@@ -97,6 +98,7 @@ dependencies {
     testImplementation Testing.robolectric
 
     testImplementation project(path: ':common-test')
+    testImplementation project(path: ':feature-toggles-test')
 
     coreLibraryDesugaring Android.tools.desugarJdkLibs
 }

ad-click/ad-click-impl/src/main/java/com/duckduckgo/adclick/impl/DuckDuckGoAdClickManager.kt

@@ -17,6 +17,7 @@
 package com.duckduckgo.adclick.impl
 
 import com.duckduckgo.adclick.api.AdClickManager
+import com.duckduckgo.adclick.impl.metrics.AdClickCollector
 import com.duckduckgo.adclick.impl.pixels.AdClickPixelName
 import com.duckduckgo.adclick.impl.pixels.AdClickPixels
 import com.duckduckgo.app.browser.UriString
@@ -33,6 +34,7 @@ class DuckDuckGoAdClickManager @Inject constructor(
     private val adClickData: AdClickData,
     private val adClickAttribution: AdClickAttribution,
     private val adClickPixels: AdClickPixels,
+    private val adClickCollector: AdClickCollector,
 ) : AdClickManager {
 
     private val publicSuffixDatabase = PublicSuffixDatabase()
@@ -223,6 +225,7 @@ class DuckDuckGoAdClickManager @Inject constructor(
                     exemptionDeadline = System.currentTimeMillis() + adClickAttribution.getTotalExpirationMillis(),
                 ),
             )
+            adClickCollector.onAdClick()
             adClickPixels.fireAdClickDetectedPixel(
                 savedAdDomain = savedAdDomain,
                 urlAdDomain = urlAdDomain,

ad-click/ad-click-impl/src/main/java/com/duckduckgo/adclick/impl/metrics/AdClickAttributedMetric.kt

@@ -0,0 +1,176 @@
+/*
+ * Copyright (c) 2025 DuckDuckGo
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.duckduckgo.adclick.impl.metrics
+
+import com.duckduckgo.app.attributed.metrics.api.AttributedMetric
+import com.duckduckgo.app.attributed.metrics.api.AttributedMetricClient
+import com.duckduckgo.app.attributed.metrics.api.AttributedMetricConfig
+import com.duckduckgo.app.attributed.metrics.api.EventStats
+import com.duckduckgo.app.attributed.metrics.api.MetricBucket
+import com.duckduckgo.app.di.AppCoroutineScope
+import com.duckduckgo.browser.api.install.AppInstall
+import com.duckduckgo.common.utils.DispatcherProvider
+import com.duckduckgo.di.scopes.AppScope
+import com.squareup.anvil.annotations.ContributesBinding
+import com.squareup.anvil.annotations.ContributesMultibinding
+import dagger.SingleInstanceIn
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.CoroutineStart.LAZY
+import kotlinx.coroutines.Deferred
+import kotlinx.coroutines.async
+import kotlinx.coroutines.launch
+import logcat.logcat
+import java.time.Instant
+import java.time.ZoneId
+import java.time.temporal.ChronoUnit
+import javax.inject.Inject
+import kotlin.math.roundToInt
+
+interface AdClickCollector {
+    fun onAdClick()
+}
+
+/**
+ * Ad clicks 7d avg Attributed Metric
+ * Trigger: on first Ad click of day
+ * Type: Daily pixel
+ * Report: 7d rolling average of ad clicks (bucketed value). Not sent if count is 0.
+ * Specs: https://app.asana.com/1/137249556945/project/1206716555947156/task/1211301604929610?focus=true
+ */
+@ContributesMultibinding(AppScope::class, AttributedMetric::class)
+@ContributesBinding(AppScope::class, AdClickCollector::class)
+@SingleInstanceIn(AppScope::class)
+class RealAdClickAttributedMetric @Inject constructor(
+    @AppCoroutineScope private val appCoroutineScope: CoroutineScope,
+    private val dispatcherProvider: DispatcherProvider,
+    private val attributedMetricClient: AttributedMetricClient,
+    private val appInstall: AppInstall,
+    private val attributedMetricConfig: AttributedMetricConfig,
+) : AttributedMetric, AdClickCollector {
+
+    companion object {
+        private const val EVENT_NAME = "ad_click"
+        private const val PIXEL_NAME = "attributed_metric_average_ad_clicks_past_week"
+        private const val FEATURE_TOGGLE_NAME = "adClickCountAvg"
+        private const val FEATURE_EMIT_TOGGLE_NAME = "canEmitAdClickCountAvg"
+        private const val DAYS_WINDOW = 7
+    }
+
+    private val isEnabled: Deferred<Boolean> = appCoroutineScope.async(start = LAZY) {
+        getToggle(FEATURE_TOGGLE_NAME)?.isEnabled() ?: false
+    }
+
+    private val canEmit: Deferred<Boolean> = appCoroutineScope.async(start = LAZY) {
+        getToggle(FEATURE_EMIT_TOGGLE_NAME)?.isEnabled() ?: false
+    }
+
+    private val bucketConfig: Deferred<MetricBucket> = appCoroutineScope.async(start = LAZY) {
+        attributedMetricConfig.getBucketConfiguration()[PIXEL_NAME] ?: MetricBucket(
+            buckets = listOf(2, 5),
+            version = 0,
+        )
+    }
+
+    override fun onAdClick() {
+        appCoroutineScope.launch(dispatcherProvider.io()) {
+            if (!isEnabled.await()) return@launch
+            attributedMetricClient.collectEvent(EVENT_NAME)
+            if (shouldSendPixel().not()) {
+                logcat(tag = "AttributedMetrics") {
+                    "AdClickCount7d: Skip emitting, not enough data or no events"
+                }
+                return@launch
+            }
+
+            if (canEmit.await()) {
+                attributedMetricClient.emitMetric(this@RealAdClickAttributedMetric)
+            }
+        }
+    }
+
+    override fun getPixelName(): String = PIXEL_NAME
+
+    override suspend fun getMetricParameters(): Map<String, String> {
+        val stats = getEventStats()
+        val params = mutableMapOf(
+            "count" to getBucketValue(stats.rollingAverage.roundToInt()).toString(),
+            "version" to bucketConfig.await().version.toString(),
+        )
+        if (!hasCompleteDataWindow()) {
+            params["dayAverage"] = daysSinceInstalled().toString()
+        }
+        return params
+    }
+
+    override suspend fun getTag(): String {
+        return daysSinceInstalled().toString()
+    }
+
+    private suspend fun getBucketValue(avg: Int): Int {
+        val buckets = bucketConfig.await().buckets
+        return buckets.indexOfFirst { bucket -> avg <= bucket }.let { index ->
+            if (index == -1) buckets.size else index
+        }
+    }
+
+    private suspend fun shouldSendPixel(): Boolean {
+        if (daysSinceInstalled() <= 0) {
+            // installation day, we don't emit
+            return false
+        }
+
+        val eventStats = getEventStats()
+        if (eventStats.daysWithEvents == 0 || eventStats.rollingAverage == 0.0) {
+            // no events, nothing to emit
+            return false
+        }
+
+        return true
+    }
+
+    private fun hasCompleteDataWindow(): Boolean {
+        val daysSinceInstalled = daysSinceInstalled()
+        return daysSinceInstalled >= DAYS_WINDOW
+    }
+
+    private suspend fun getEventStats(): EventStats {
+        val daysSinceInstall = daysSinceInstalled()
+        val stats = if (daysSinceInstall >= DAYS_WINDOW) {
+            attributedMetricClient.getEventStats(EVENT_NAME, DAYS_WINDOW)
+        } else {
+            attributedMetricClient.getEventStats(EVENT_NAME, daysSinceInstall)
+        }
+
+        return stats
+    }
+
+    private fun daysSinceInstalled(): Int {
+        val etZone = ZoneId.of("America/New_York")
+        val installInstant = Instant.ofEpochMilli(appInstall.getInstallationTimestamp())
+        val nowInstant = Instant.now()
+
+        val installInEt = installInstant.atZone(etZone)
+        val nowInEt = nowInstant.atZone(etZone)
+
+        return ChronoUnit.DAYS.between(installInEt.toLocalDate(), nowInEt.toLocalDate()).toInt()
+    }
+
+    private suspend fun getToggle(toggleName: String) =
+        attributedMetricConfig.metricsToggles().firstOrNull { toggle ->
+            toggle.featureName().name == toggleName
+        }
+}

ad-click/ad-click-impl/src/test/java/com/duckduckgo/adclick/impl/DuckDuckGoAdClickManagerTest.kt

@@ -18,6 +18,7 @@ package com.duckduckgo.adclick.impl
 
 import androidx.test.ext.junit.runners.AndroidJUnit4
 import com.duckduckgo.adclick.api.AdClickManager
+import com.duckduckgo.adclick.impl.metrics.AdClickCollector
 import com.duckduckgo.adclick.impl.pixels.AdClickPixelName
 import com.duckduckgo.adclick.impl.pixels.AdClickPixels
 import org.junit.Assert.assertFalse
@@ -40,11 +41,12 @@ class DuckDuckGoAdClickManagerTest {
     private val mockAdClickData: AdClickData = mock()
     private val mockAdClickAttribution: AdClickAttribution = mock()
     private val mockAdClickPixels: AdClickPixels = mock()
+    private val mockAdClickCollector: AdClickCollector = mock()
     private lateinit var testee: AdClickManager
 
     @Before
     fun before() {
-        testee = DuckDuckGoAdClickManager(mockAdClickData, mockAdClickAttribution, mockAdClickPixels)
+        testee = DuckDuckGoAdClickManager(mockAdClickData, mockAdClickAttribution, mockAdClickPixels, mockAdClickCollector)
     }
 
     @Test