diff --git a/dev/opentelemetry-lwt/Opentelemetry_lwt/Metrics/index.html b/dev/opentelemetry-lwt/Opentelemetry_lwt/Metrics/index.html
index ff9c7317..89ee202c 100644
--- a/dev/opentelemetry-lwt/Opentelemetry_lwt/Metrics/index.html
+++ b/dev/opentelemetry-lwt/Opentelemetry_lwt/Metrics/index.html
@@ -1,13 +1,13 @@
 <!DOCTYPE html>
-<html xmlns="http://www.w3.org/1999/xhtml"><head><title>Metrics (opentelemetry-lwt.Opentelemetry_lwt.Metrics)</title><link rel="stylesheet" href="../../../odoc.css"/><meta charset="utf-8"/><meta name="generator" content="odoc 2.1.0"/><meta name="viewport" content="width=device-width,initial-scale=1.0"/><script src="../../../highlight.pack.js"></script><script>hljs.initHighlightingOnLoad();</script></head><body class="odoc"><nav class="odoc-nav"><a href="../index.html">Up</a> – <a href="../../index.html">opentelemetry-lwt</a> &#x00BB; <a href="../index.html">Opentelemetry_lwt</a> &#x00BB; Metrics</nav><header class="odoc-preamble"><h1>Module <code><span>Opentelemetry_lwt.Metrics</span></code></h1></header><div class="odoc-content"><div class="odoc-include"><details open="open"><summary class="spec include"><code><span><span class="keyword">include</span> <span class="keyword">module</span> <span class="keyword">type</span> <span class="keyword">of</span> <span class="keyword">struct</span> <span class="keyword">include</span> <a href="../../../opentelemetry/Opentelemetry/Metrics/index.html">Opentelemetry.Metrics</a> <span class="keyword">end</span></span></code></summary><p>Metrics.</p><p>See <a href="https://opentelemetry.io/docs/reference/specification/overview/#metric-signal">the spec</a></p><div class="odoc-spec"><div class="spec type" id="type-t" class="anchored"><a href="#type-t" class="anchor"></a><code><span><span class="keyword">type</span> t</span></code></div></div><div class="odoc-spec"><div class="spec value" id="val-float" class="anchored"><a href="#val-float" class="anchor"></a><code><span><span class="keyword">val</span> float : 
-  <span>?start_time_unix_nano:int64 <span class="arrow">&#45;&gt;</span></span>
+<html xmlns="http://www.w3.org/1999/xhtml"><head><title>Metrics (opentelemetry-lwt.Opentelemetry_lwt.Metrics)</title><link rel="stylesheet" href="../../../odoc.css"/><meta charset="utf-8"/><meta name="generator" content="odoc 2.1.0"/><meta name="viewport" content="width=device-width,initial-scale=1.0"/><script src="../../../highlight.pack.js"></script><script>hljs.initHighlightingOnLoad();</script></head><body class="odoc"><nav class="odoc-nav"><a href="../index.html">Up</a> – <a href="../../index.html">opentelemetry-lwt</a> &#x00BB; <a href="../index.html">Opentelemetry_lwt</a> &#x00BB; Metrics</nav><header class="odoc-preamble"><h1>Module <code><span>Opentelemetry_lwt.Metrics</span></code></h1></header><div class="odoc-content"><div class="odoc-include"><details open="open"><summary class="spec include"><code><span><span class="keyword">include</span> <span class="keyword">module</span> <span class="keyword">type</span> <span class="keyword">of</span> <span class="keyword">struct</span> <span class="keyword">include</span> <a href="../../../opentelemetry/Opentelemetry/Metrics/index.html">Opentelemetry.Metrics</a> <span class="keyword">end</span></span></code></summary><p>Metrics.</p><p>See <a href="https://opentelemetry.io/docs/reference/specification/overview/#metric-signal">the spec</a></p><div class="odoc-spec"><div class="spec type" id="type-t" class="anchored"><a href="#type-t" class="anchor"></a><code><span><span class="keyword">type</span> t</span></code></div></div><div class="odoc-spec"><div class="spec value" id="val-_program_start" class="anchored"><a href="#val-_program_start" class="anchor"></a><code><span><span class="keyword">val</span> _program_start : <a href="../../../opentelemetry/Opentelemetry/Timestamp_ns/index.html#type-t">Opentelemetry.Timestamp_ns.t</a></span></code></div></div><div class="odoc-spec"><div class="spec value" id="val-float" class="anchored"><a href="#val-float" class="anchor"></a><code><span><span class="keyword">val</span> float : 
+  <span>?start_time_unix_nano:<a href="../../../opentelemetry/Opentelemetry/Timestamp_ns/index.html#type-t">Opentelemetry.Timestamp_ns.t</a> <span class="arrow">&#45;&gt;</span></span>
   <span>?now:<a href="../../../opentelemetry/Opentelemetry/Timestamp_ns/index.html#type-t">Opentelemetry.Timestamp_ns.t</a> <span class="arrow">&#45;&gt;</span></span>
   <span>?attrs:
     <span><span>(string * <span>[&lt; <span>`Bool of bool</span> <span><span>| `Int</span> of int</span> <span>| `None</span> <span><span>| `String</span> of string</span> ]</span>)</span>
       list</span> <span class="arrow">&#45;&gt;</span></span>
   <span>float <span class="arrow">&#45;&gt;</span></span>
   <span class="xref-unresolved">Opentelemetry__Metrics_types.number_data_point</span></span></code></div><div class="spec-doc"><p>Number data point, as a float</p></div></div><div class="odoc-spec"><div class="spec value" id="val-int" class="anchored"><a href="#val-int" class="anchor"></a><code><span><span class="keyword">val</span> int : 
-  <span>?start_time_unix_nano:int64 <span class="arrow">&#45;&gt;</span></span>
+  <span>?start_time_unix_nano:<a href="../../../opentelemetry/Opentelemetry/Timestamp_ns/index.html#type-t">Opentelemetry.Timestamp_ns.t</a> <span class="arrow">&#45;&gt;</span></span>
   <span>?now:<a href="../../../opentelemetry/Opentelemetry/Timestamp_ns/index.html#type-t">Opentelemetry.Timestamp_ns.t</a> <span class="arrow">&#45;&gt;</span></span>
   <span>?attrs:
     <span><span>(string * <span>[&lt; <span>`Bool of bool</span> <span><span>| `Int</span> of int</span> <span>| `None</span> <span><span>| `String</span> of string</span> ]</span>)</span>
diff --git a/dev/opentelemetry/Opentelemetry/Metrics/index.html b/dev/opentelemetry/Opentelemetry/Metrics/index.html
index 23f7d8e0..ec96a886 100644
--- a/dev/opentelemetry/Opentelemetry/Metrics/index.html
+++ b/dev/opentelemetry/Opentelemetry/Metrics/index.html
@@ -1,13 +1,13 @@
 <!DOCTYPE html>
-<html xmlns="http://www.w3.org/1999/xhtml"><head><title>Metrics (opentelemetry.Opentelemetry.Metrics)</title><link rel="stylesheet" href="../../../odoc.css"/><meta charset="utf-8"/><meta name="generator" content="odoc 2.1.0"/><meta name="viewport" content="width=device-width,initial-scale=1.0"/><script src="../../../highlight.pack.js"></script><script>hljs.initHighlightingOnLoad();</script></head><body class="odoc"><nav class="odoc-nav"><a href="../index.html">Up</a> – <a href="../../index.html">opentelemetry</a> &#x00BB; <a href="../index.html">Opentelemetry</a> &#x00BB; Metrics</nav><header class="odoc-preamble"><h1>Module <code><span>Opentelemetry.Metrics</span></code></h1><p>Metrics.</p><p>See <a href="https://opentelemetry.io/docs/reference/specification/overview/#metric-signal">the spec</a></p></header><div class="odoc-content"><div class="odoc-spec"><div class="spec type" id="type-t" class="anchored"><a href="#type-t" class="anchor"></a><code><span><span class="keyword">type</span> t</span></code></div></div><div class="odoc-spec"><div class="spec value" id="val-float" class="anchored"><a href="#val-float" class="anchor"></a><code><span><span class="keyword">val</span> float : 
-  <span>?start_time_unix_nano:int64 <span class="arrow">&#45;&gt;</span></span>
+<html xmlns="http://www.w3.org/1999/xhtml"><head><title>Metrics (opentelemetry.Opentelemetry.Metrics)</title><link rel="stylesheet" href="../../../odoc.css"/><meta charset="utf-8"/><meta name="generator" content="odoc 2.1.0"/><meta name="viewport" content="width=device-width,initial-scale=1.0"/><script src="../../../highlight.pack.js"></script><script>hljs.initHighlightingOnLoad();</script></head><body class="odoc"><nav class="odoc-nav"><a href="../index.html">Up</a> – <a href="../../index.html">opentelemetry</a> &#x00BB; <a href="../index.html">Opentelemetry</a> &#x00BB; Metrics</nav><header class="odoc-preamble"><h1>Module <code><span>Opentelemetry.Metrics</span></code></h1><p>Metrics.</p><p>See <a href="https://opentelemetry.io/docs/reference/specification/overview/#metric-signal">the spec</a></p></header><div class="odoc-content"><div class="odoc-spec"><div class="spec type" id="type-t" class="anchored"><a href="#type-t" class="anchor"></a><code><span><span class="keyword">type</span> t</span></code></div></div><div class="odoc-spec"><div class="spec value" id="val-_program_start" class="anchored"><a href="#val-_program_start" class="anchor"></a><code><span><span class="keyword">val</span> _program_start : <a href="../Timestamp_ns/index.html#type-t">Timestamp_ns.t</a></span></code></div></div><div class="odoc-spec"><div class="spec value" id="val-float" class="anchored"><a href="#val-float" class="anchor"></a><code><span><span class="keyword">val</span> float : 
+  <span>?start_time_unix_nano:<a href="../Timestamp_ns/index.html#type-t">Timestamp_ns.t</a> <span class="arrow">&#45;&gt;</span></span>
   <span>?now:<a href="../Timestamp_ns/index.html#type-t">Timestamp_ns.t</a> <span class="arrow">&#45;&gt;</span></span>
   <span>?attrs:
     <span><span>(string * <span>[&lt; <span>`Bool of bool</span> <span><span>| `Int</span> of int</span> <span>| `None</span> <span><span>| `String</span> of string</span> ]</span>)</span>
       list</span> <span class="arrow">&#45;&gt;</span></span>
   <span>float <span class="arrow">&#45;&gt;</span></span>
   <span class="xref-unresolved">Opentelemetry__Metrics_types.number_data_point</span></span></code></div><div class="spec-doc"><p>Number data point, as a float</p></div></div><div class="odoc-spec"><div class="spec value" id="val-int" class="anchored"><a href="#val-int" class="anchor"></a><code><span><span class="keyword">val</span> int : 
-  <span>?start_time_unix_nano:int64 <span class="arrow">&#45;&gt;</span></span>
+  <span>?start_time_unix_nano:<a href="../Timestamp_ns/index.html#type-t">Timestamp_ns.t</a> <span class="arrow">&#45;&gt;</span></span>
   <span>?now:<a href="../Timestamp_ns/index.html#type-t">Timestamp_ns.t</a> <span class="arrow">&#45;&gt;</span></span>
   <span>?attrs:
     <span><span>(string * <span>[&lt; <span>`Bool of bool</span> <span><span>| `Int</span> of int</span> <span>| `None</span> <span><span>| `String</span> of string</span> ]</span>)</span>
