DateTime::ISO8601 is not fine-grained enough for logs

[markkimsal]

I'm throwing some logs at ES and when I'm viewing them in grafana in the table viewer, some record are out of order because they happen at the same second. ES can handle milliseconds since epoch as a default datetime format.

If I make a change like this:

class ElasticsearchFormatter extends NormalizerFormatter
{
    /**
     * @var string
     */
    private $type;

    /**
     * @var string
     */
    private $index;

    public function __construct($index, $type)
    { 
        parent::__construct('U.u');

        $this->index = $index;
        $this->type = $type;
    } 

    public function format(array $record)
    { 
        $record = parent::format($record);
        $record['datetime'] = (int)round($record['datetime']*1000);

        var_dump(
            $record                                                                                                                                                   
        );
        die();
        return [ 
            'type'      => $this->type,
            'index'     => $this->index,
            'body'      => $record
        ];
    } 

Then I can see that it works and it saves to ES quite readily.

Note that I had to change the Normalizer's date format to 'U.u', and to specifically cast as an int because a float value gets an extra ".0" added to it when it gets converted to JSON.