[iOS][Composebox] Add attachment type UMAs [chromium/src : main]

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Matt Reichhoff (Gerrit)

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Mar 31, 2026, 1:40:40 PM (2 days ago) Mar 31
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Matt Reichhoff . unresolved

sending to christianxu@

Feel free to say no if these aren't useful, but especially the counts at submission/navigation seem like interesting data to get

File ios/chrome/browser/composebox/ui/composebox_input_item_collection.mm
Line 67, Patchset 1 (Parent): if (item.type == ComposeboxInputItemType::kComposeboxInputItemTypeFile) {
Matt Reichhoff . unresolved

this looks like an existing bug? Seems like the counts were using the wrong category

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Christian Xu (Gerrit)

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Apr 1, 2026, 5:13:00 AM (yesterday) Apr 1
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File ios/chrome/browser/composebox/ui/composebox_input_item_collection.mm
Line 67, Patchset 1 (Parent): if (item.type == ComposeboxInputItemType::kComposeboxInputItemTypeFile) {
Matt Reichhoff . unresolved

this looks like an existing bug? Seems like the counts were using the wrong category

Christian Xu

Thanks for fixing that!

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    Christian Xu (Gerrit)

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    Apr 1, 2026, 10:39:57 AM (yesterday) Apr 1
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    Matt Reichhoff . unresolved

    sending to christianxu@

    Feel free to say no if these aren't useful, but especially the counts at submission/navigation seem like interesting data to get

    Christian Xu

    These are definitely useful, in fact we just got asked to record these exact metrics. Thank you for adding them!

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    Matt Reichhoff (Gerrit)

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    adding mahmadi@ for histograms.xml

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    Matt Reichhoff (Gerrit)

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    Apr 1, 2026, 10:48:09 AM (yesterday) Apr 1
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    Matt Reichhoff . resolved

    sending to christianxu@

    Feel free to say no if these aren't useful, but especially the counts at submission/navigation seem like interesting data to get

    Christian Xu

    These are definitely useful, in fact we just got asked to record these exact metrics. Thank you for adding them!

    Matt Reichhoff

    oh, great! will get this submitted

    File ios/chrome/browser/composebox/ui/composebox_input_item_collection.mm
    Line 67, Patchset 1 (Parent): if (item.type == ComposeboxInputItemType::kComposeboxInputItemTypeFile) {
    Matt Reichhoff . resolved

    this looks like an existing bug? Seems like the counts were using the wrong category

    Christian Xu

    Thanks for fixing that!

    Matt Reichhoff

    np, though given a merge conflict I think someone else also found it 😊

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      Moe Ahmadi (Gerrit)

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      10:43 AM (9 hours ago) 10:43 AM
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      Moe Ahmadi . unresolved

      Metrics changes LGTM, but I'd like to have x-platform metrics where possible. CC both @nih...@google.com @khali...@chromium.org who are adding metrics.

      File tools/metrics/histograms/metadata/omnibox/histograms.xml
      Line 2554, Patchset 4 (Latest):<histogram name="Omnibox.MobileFusebox.AttachmentCountAtSubmission.{Type}"
      Moe Ahmadi . unresolved

      curious why aren't we logging metrics cross-platform? See "ContextualSearch.Inputs.TypeOnSubmission" added in crrev.com/c/7701697 and a bunch of other metrics logged via components/contextual_search/contextual_search_metrics_recorder.cc in
      tools/metrics/histograms/metadata/contextual_search/histograms.xml

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        Moe Ahmadi (Gerrit)

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        Matt Reichhoff (Gerrit)

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        File tools/metrics/histograms/metadata/omnibox/histograms.xml
        Line 2554, Patchset 4 (Latest):<histogram name="Omnibox.MobileFusebox.AttachmentCountAtSubmission.{Type}"
        Moe Ahmadi . unresolved

        curious why aren't we logging metrics cross-platform? See "ContextualSearch.Inputs.TypeOnSubmission" added in crrev.com/c/7701697 and a bunch of other metrics logged via components/contextual_search/contextual_search_metrics_recorder.cc in
        tools/metrics/histograms/metadata/contextual_search/histograms.xml

        Matt Reichhoff

        I'm happy to make the metrics in this CL cross-platform (intended to do so in follow-up CLs), but wanted to start with bling as that's the surface I work on.

        I checked other metrics and didn't see the "attachment count by type at submission"; the tab selector also had an iOS-specific metric, and I wanted to get image/file selector metrics as well.

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        Matt Reichhoff (Gerrit)

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        File tools/metrics/histograms/metadata/omnibox/histograms.xml
        Line 2554, Patchset 4 (Latest):<histogram name="Omnibox.MobileFusebox.AttachmentCountAtSubmission.{Type}"
        Moe Ahmadi . unresolved

        curious why aren't we logging metrics cross-platform? See "ContextualSearch.Inputs.TypeOnSubmission" added in crrev.com/c/7701697 and a bunch of other metrics logged via components/contextual_search/contextual_search_metrics_recorder.cc in
        tools/metrics/histograms/metadata/contextual_search/histograms.xml

        Matt Reichhoff

        I'm happy to make the metrics in this CL cross-platform (intended to do so in follow-up CLs), but wanted to start with bling as that's the surface I work on.

        I checked other metrics and didn't see the "attachment count by type at submission"; the tab selector also had an iOS-specific metric, and I wanted to get image/file selector metrics as well.

        Matt Reichhoff

        sorry, correction, not an iOS-specific metric, but written from the iOS UI code*

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        Nihar Majmudar (Gerrit)

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        Code-Review+1

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        Nihar Majmudar . resolved

        LGTM

        Moe Ahmadi . resolved

        Metrics changes LGTM, but I'd like to have x-platform metrics where possible. CC both @nih...@google.com @khali...@chromium.org who are adding metrics.

        Nihar Majmudar

        +1 the making this x-platform eventually. I'll add to the existing metrics doc of places where iOS and Desktop metrics overlap and maybe where we can consolidate some metrics.

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        Matt Reichhoff (Gerrit)

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        Matt Reichhoff . resolved

        happy to revisit or build x-platform equivalents...landing in the meantime

        File tools/metrics/histograms/metadata/omnibox/histograms.xml
        Line 2554, Patchset 4 (Latest):<histogram name="Omnibox.MobileFusebox.AttachmentCountAtSubmission.{Type}"
        Moe Ahmadi . resolved

        curious why aren't we logging metrics cross-platform? See "ContextualSearch.Inputs.TypeOnSubmission" added in crrev.com/c/7701697 and a bunch of other metrics logged via components/contextual_search/contextual_search_metrics_recorder.cc in
        tools/metrics/histograms/metadata/contextual_search/histograms.xml

        Matt Reichhoff

        I'm happy to make the metrics in this CL cross-platform (intended to do so in follow-up CLs), but wanted to start with bling as that's the surface I work on.

        I checked other metrics and didn't see the "attachment count by type at submission"; the tab selector also had an iOS-specific metric, and I wanted to get image/file selector metrics as well.

        Matt Reichhoff

        sorry, correction, not an iOS-specific metric, but written from the iOS UI code*

        Matt Reichhoff

        resolving based on niharm@'s comment

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          to Matt Reichhoff, Nihar Majmudar, Khalid Peer, Christian Xu, Chromium Metrics Reviews, chromium...@chromium.org, asvitkine...@chromium.org, feature-me...@chromium.org, ios-revie...@chromium.org, ios-r...@chromium.org, marq+...@chromium.org

          Chromium LUCI CQ submitted the change

          Change information

          Commit message:
          [iOS][Composebox] Add attachment type UMAs

          This CL adds new UMA for the attachments on submission of a fusebox
          navigation. It also adds equivalent metrics as TabPickerTabsAttached
          for images and files.
          Change-Id: Ib6b3225fdae07cd59cd7ea47cd61d935a9664c01
          Reviewed-by: Moe Ahmadi <mah...@chromium.org>
          Reviewed-by: Christian Xu <chris...@chromium.org>
          Commit-Queue: Matt Reichhoff <mreic...@chromium.org>
          Reviewed-by: Nihar Majmudar <nih...@google.com>
          Cr-Commit-Position: refs/heads/main@{#1609407}
          Files:
          Change size: M
          Delta: 6 files changed, 128 insertions(+), 0 deletions(-)
          Branch: refs/heads/main
          Submit Requirements:
          • requirement satisfiedCode-Review: +1 by Christian Xu, +1 by Nihar Majmudar, +1 by Moe Ahmadi
          Open in Gerrit
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          Gerrit-MessageType: merged
          Gerrit-Project: chromium/src
          Gerrit-Branch: main
          Gerrit-Change-Id: Ib6b3225fdae07cd59cd7ea47cd61d935a9664c01
          Gerrit-Change-Number: 7711356
          Gerrit-PatchSet: 5
          Gerrit-Owner: Matt Reichhoff <mreic...@chromium.org>
          Gerrit-Reviewer: Christian Xu <chris...@chromium.org>
          Gerrit-Reviewer: Chromium LUCI CQ <chromiu...@luci-project-accounts.iam.gserviceaccount.com>
          Gerrit-Reviewer: Matt Reichhoff <mreic...@chromium.org>
          Gerrit-Reviewer: Moe Ahmadi <mah...@chromium.org>
          Gerrit-Reviewer: Nihar Majmudar <nih...@google.com>
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