chore: prepare release 6.1.6

[mparticle-automation]

Release 6.1.6

Release details

• Version: 6.1.6
• Bump type: patch
• Base branch: main

Files updated

• VERSION set to 6.1.6
• CHANGELOG.md updated with the generated release notes

Validation

The Release – Draft workflow successfully smoke-tested Maven local publication for the core SDK, aggregate kits, and isolated kits before opening this PR.

Changelog

Core

Fixed

• Handle empty success responses and add end-to-end payload tests (#880)
• Include changelog notes in GitHub releases (#874)

Changed

• Add public repository confidentiality rules for agents (#884)
• Add the Kotlin migration playbook and tracker (#846)

Kits

Comscore

Fixed

• Keep Comscore kit compatible with Android API 35 and update Mockito (#860)

Rokt

Fixed

• Update Rokt SDK and payment extension to 6.2.1 (#886)

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On merge: The Release – Publish workflow will publish the core SDK, aggregate and isolated kits, and rokt-sdk-plus to Maven Central, tag the release, and create the GitHub release.

[github-actions]

Kotlin migration progress

No change to the Java left to convert.

Module	Kotlin LOC	Java LOC	Java staying (facade)	Java left to convert	Kotlin share
android-core	3,238	22,515	9,636	12,879	12.6%
android-kit-base	557	5,380	1,651	3,729	9.4%
Total	3,795	27,895	11,287	16,608	12.0%

Conversion progress: 0.0% (16,608 of 16,550 baseline Java LOC left to convert). 132 Java files and 36 Kotlin files in scope.

[github-actions]

Binary compatibility

• ✅ android-core is compatible with 6.1.5 (115 classes compared, 1 with additions only).
• ✅ android-kit-base is compatible with 6.1.5 (44 classes compared, 0 with additions only).

Compares the release AAR against the same artifact at the last version published to Maven Central; R8-renamed classes and members are excluded (see the script docstring). Full japicmp HTML/XML reports are attached as the api-compat-reports workflow artifact. This check is not in the required-check set yet, so a red result here does not block merging.

[github-actions]

📦 SDK Size Impact Report

What the SDK adds to a minified release APK.

mParticle Core SDK

Measured against an empty baseline app. Unlike the Rokt kit, android-core ships no Compose and no resources, so there is nothing here that a host app would already provide.

Metric	Target branch	This PR	Change
APK size	119.79 KB	119.78 KB	-7 bytes
Download size	117.61 KB	117.60 KB	-7 bytes
Dex bytes	213.75 KB	213.75 KB	0 bytes

mParticle Core + Rokt kit

Measured against a Compose + Material3 reference app, so these are the costs on top of an app that already ships Compose. The reference app's dependencies are a documented convention, not a measured average: see size-report-rokt/README.md.

Metric	Target branch	This PR	Change
APK size	1.26 MB	1.26 MB	0 bytes
Download size	1.24 MB	1.24 MB	-3 bytes
Dex bytes	2.22 MB	2.22 MB	0 bytes

Rokt SDK+ umbrella (adds the payment extension)

Metric	Target branch	This PR	Change	On top of mParticle Core + Rokt kit
APK size	6.53 MB	6.53 MB	0 bytes	+5.27 MB
Download size	6.43 MB	6.43 MB	0 bytes	+5.19 MB
Dex bytes	7.10 MB	7.10 MB	0 bytes	+4.89 MB

➡️ SDK size impact change is minimal.

Raw measurements

core, Target branch:

{"baseline_dex_bytes": 0, "baseline_download_bytes": 2513, "baseline_install_bytes": 7529, "core_dex_bytes": 218884, "core_download_bytes": 122942, "core_install_bytes": 130195}

core, This PR:

{"baseline_dex_bytes": 0, "baseline_download_bytes": 2512, "baseline_install_bytes": 7528, "core_dex_bytes": 218884, "core_download_bytes": 122934, "core_install_bytes": 130187}

rokt, Target branch:

{"baseline_dex_bytes": 1829108, "baseline_download_bytes": 1240062, "baseline_install_bytes": 1300934, "kit_dex_bytes": 4156172, "kit_download_bytes": 2540470, "kit_install_bytes": 2623275, "sdkplus_dex_bytes": 9278828, "sdkplus_download_bytes": 7978829, "sdkplus_install_bytes": 8148975}

rokt, This PR:

{"baseline_dex_bytes": 1829108, "baseline_download_bytes": 1240062, "baseline_install_bytes": 1300934, "kit_dex_bytes": 4156172, "kit_download_bytes": 2540467, "kit_install_bytes": 2623275, "sdkplus_dex_bytes": 9278828, "sdkplus_download_bytes": 7978829, "sdkplus_install_bytes": 8148975}

_{Measured 2ee2fbf merged into 89637ca}