[AroseKhanNiazi]

pawn Код:

public OnPlayerDeath(playerid, killerid, reason)
{
    new duelSTR[200];
    
    new Float:H,Float:A;
        GetPlayerHealth(killerid,H);
        GetPlayerArmour(killerid,A);
    
    format(duelSTR,sizeof(duelSTR),"%s killed %s (life reaming: %f)",GetName(killerid),GetName(playerid),H+A);
    SendClientMessageToAll(0xD5D48FFF,duelSTR);
    return 1;
}

its and float value so use %f