diff --git a/docs/examples/spans.md b/docs/examples/spans.md
index f3f05c0..a64c3cb 100644
--- a/docs/examples/spans.md
+++ b/docs/examples/spans.md
@@ -2,8 +2,14 @@
 Please consult the documentation for your exact needs.
 Below is an example to add spans for MySQL, Redis and generic request wraped by a parent span.
 
-![Dashboard](https://github.com/philkra/elastic-apm-php-agent/blob/master/docs/examples/blob/span_dashboard.png "Spans Dashboard") ![Stacktrace](https://github.com/philkra/elastic-apm-php-agent/blob/master/docs/examples/blob/span_stacktrace.png "Span Stacktrace")
+## Screenshots
+**Transactions Dashboard showing the Spans**
+![Dashboard](https://github.com/philkra/elastic-apm-php-agent/blob/master/docs/examples/blob/span_overview.png "Spans Dashboard")
 
+**Stacktrace of a Span**
+![Stacktrace](https://github.com/philkra/elastic-apm-php-agent/blob/master/docs/examples/blob/span_stacktrace.png "Span Stacktrace")
+
+## Example Code
 ```php
 // create the agent
 $agent = new \PhilKra\Agent(['appName' => 'examples']);
diff --git a/src/Events/DefaultEventFactory.php b/src/Events/DefaultEventFactory.php
index 811aa3f..b7ca7b7 100644
--- a/src/Events/DefaultEventFactory.php
+++ b/src/Events/DefaultEventFactory.php
@@ -31,7 +31,7 @@ public function newSpan(string $name, EventBean $parent): Span
     /**
      * {@inheritdoc}
      */
-    public function newMetricset($set, $tags): Metricset
+    public function newMetricset(array $set, array $tags = []): Metricset
     {
         return new Metricset($set, $tags);
     }
diff --git a/src/Events/EventBean.php b/src/Events/EventBean.php
index 3dd348a..560cc0b 100644
--- a/src/Events/EventBean.php
+++ b/src/Events/EventBean.php
@@ -40,13 +40,6 @@ class EventBean
      */
     private $parentId = null;
 
-    /**
-     * Offset between the current Event and the parent Event's
-     *
-     * @var number
-     */
-    private $parentTimestampOffset = null;
-
     /**
      * Error occurred on Timestamp
      *
@@ -188,7 +181,6 @@ public function setParent(EventBean $parent)
     {
         $this->setParentId($parent->getId());
         $this->setTraceId($parent->getTraceId());
-        $this->parentTimestampOffset = ($this->getTimestamp() - $parent->getTimestamp());
     }
 
     /**
diff --git a/src/Events/EventFactoryInterface.php b/src/Events/EventFactoryInterface.php
index d7db1cd..068f488 100644
--- a/src/Events/EventFactoryInterface.php
+++ b/src/Events/EventFactoryInterface.php
@@ -45,6 +45,6 @@ public function newSpan(string $name, EventBean $parent): Span;
      *
      * @return Metricset
      */
-    public function newMetricset($set, $tags): Metricset;
+    public function newMetricset(array $set, array $tags = []): Metricset;
 
 }
diff --git a/src/Events/Metricset.php b/src/Events/Metricset.php
index f64edf2..c839990 100644
--- a/src/Events/Metricset.php
+++ b/src/Events/Metricset.php
@@ -26,7 +26,7 @@ class Metricset extends EventBean implements \JsonSerializable
      * @param array $set
      * @param array $tags
      */
-    public function __construct(array $set, array $tags)
+    public function __construct(array $set, array $tags = [])
     {
         parent::__construct([]);
         foreach($set as $k => $v) {
@@ -47,6 +47,7 @@ public function jsonSerialize() : array
         return [
             'metricset' => [
                 'samples'   => $this->samples,
+//                'tags'      => $this->tags,
                 'timestamp' => $this->getTimestamp(),
             ]
         ];