From 7db8e99f86b20c6dd2386f34750ec7fc93499340 Mon Sep 17 00:00:00 2001
From: Diego Hurtado <ocelotl@users.noreply.github.com>
Date: Mon, 25 Oct 2021 14:24:02 +0200
Subject: [PATCH] Add timestamp for last value

---
 .../src/opentelemetry/sdk/metrics/aggregation.py            | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/opentelemetry-sdk/src/opentelemetry/sdk/metrics/aggregation.py b/opentelemetry-sdk/src/opentelemetry/sdk/metrics/aggregation.py
index 1a592db1a84..066847d9ad9 100644
--- a/opentelemetry-sdk/src/opentelemetry/sdk/metrics/aggregation.py
+++ b/opentelemetry-sdk/src/opentelemetry/sdk/metrics/aggregation.py
@@ -20,6 +20,7 @@
     AGGREGATION_TEMPORALITY_CUMULATIVE,
     AGGREGATION_TEMPORALITY_DELTA,
 )
+from opentelemetry.util._time import _time_ns
 
 
 class Aggregation(ABC):
@@ -77,8 +78,13 @@ class LastValueAggregation(Aggregation):
     This aggregation collects data for the SDK sum metric point.
     """
 
+    def __init__(self):
+        super().__init__()
+        self._timestamp = _time_ns()
+
     def aggregate(self, value):
         self._value = value
+        self._timestamp = _time_ns()
 
     def collect(self):
         return self._value