Add commit stats limit indicator

We should be explicit about 2000 commits limit at
branch graphs page

app/controllers/projects/graphs_controller.rb

@@ -37,7 +37,8 @@ class Projects::GraphsController < Projects::ApplicationController
   private
 
   def get_commits
-    @commits = @project.repository.commits(@ref, limit: 2000, skip_merges: true)
+    @commits_limit = 2000
+    @commits = @project.repository.commits(@ref, limit: @commits_limit, skip_merges: true)
     @commits_graph = Gitlab::Graphs::Commits.new(@commits)
     @commits_per_week_days = @commits_graph.commits_per_week_days
     @commits_per_time = @commits_graph.commits_per_time

app/views/projects/graphs/charts.html.haml

@@ -20,6 +20,7 @@
         - end_time = capture do
           #{@commits_graph.end_date.strftime('%b %d')}
         = (_("Commit statistics for %{ref} %{start_time} - %{end_time}") % { ref: "<strong>#{h @ref}</strong>", start_time: start_time, end_time: end_time }).html_safe
+      = _("Excluding merge commits. Limited to %{limit} commits.") % {limit: number_with_delimiter(@commits_limit, delimiter: ',')}
 
     .col-md-6
       .tree-ref-container

changelogs/unreleased/28627-adjust-commit-stats-over-limit-indication.yml

+---
+title: Add commits limit text at graphs page
+merge_request: 24990
+author:
+type: changed

locale/gitlab.pot

@@ -7872,6 +7872,9 @@ msgstr ""
 msgid "Except policy:"
 msgstr ""
 
+msgid "Excluding merge commits. Limited to %{limit} commits."
+msgstr ""
+
 msgid "Excluding merge commits. Limited to 6,000 commits."
 msgstr ""