Trace2:gvfs:experiment: capture more 'tracking' details

Update tracing around report_tracking() to use 'tracking' category
rather than 'exp' category.

Add ahead/behind results from stat_tracking_info().

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>

builtin/checkout.c

@@ -990,12 +990,12 @@ static void update_refs_for_switch(const struct checkout_opts *opts,
 	    (new_branch_info->path || (!opts->force_detach && !strcmp(new_branch_info->name, "HEAD")))) {
 		unsigned long nr_unpack_entry_at_start;
 
-		trace2_region_enter("exp", "report_tracking", the_repository);
+		trace2_region_enter("tracking", "report_tracking", the_repository);
 		nr_unpack_entry_at_start = get_nr_unpack_entry();
 		report_tracking(new_branch_info);
-		trace2_data_intmax("exp", NULL, "report_tracking/nr_unpack_entries",
+		trace2_data_intmax("tracking", NULL, "report_tracking/nr_unpack_entries",
 				   (intmax_t)(get_nr_unpack_entry() - nr_unpack_entry_at_start));
-		trace2_region_leave("exp", "report_tracking", the_repository);
+		trace2_region_leave("tracking", "report_tracking", the_repository);
 	}
 }
 

remote.c

@@ -2255,7 +2255,16 @@ int format_tracking_info(struct branch *branch, struct strbuf *sb,
 	char *base;
 	int upstream_is_gone = 0;
 
+	trace2_region_enter("tracking", "stat_tracking_info", NULL);
 	sti = stat_tracking_info(branch, &ours, &theirs, &full_base, 0, abf);
+	trace2_data_intmax("tracking", NULL, "stat_tracking_info/ab_flags", abf);
+	trace2_data_intmax("tracking", NULL, "stat_tracking_info/ab_result", sti);
+	if (sti >= 0 && abf == AHEAD_BEHIND_FULL) {
+	    trace2_data_intmax("tracking", NULL, "stat_tracking_info/ab_ahead", ours);
+	    trace2_data_intmax("tracking", NULL, "stat_tracking_info/ab_behind", theirs);
+	}
+	trace2_region_leave("tracking", "stat_tracking_info", NULL);
+
 	if (sti < 0) {
 		if (!full_base)
 			return 0;