From 19c3b2506cbe7d40ff27db16b71361d7605ed45d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Emilio=20Alvarez=20Pi=C3=B1eiro?=
 <95703246+emilioalvap@users.noreply.github.com>
Date: Fri, 4 Aug 2023 14:52:11 +0200
Subject: [PATCH] [Heartbeat] Add default TZ to heartbeat docker images
 (#36193)

## What does this PR do?

Fixes https://github.com/elastic/beats/issues/36117. Add default TZ
value to fix synthetic journeys for timezone-triggered errors.

## Why is it important?

Unspecified timezone values can cause navigation errors on synthetics
journeys.

3# How to test this PR locally

1. Build heartbeat docker image locally.
2. Create a journey that navigates to a Kibana URL.
3. Wait for Kibana login page to load properly.
---
 CHANGELOG.next.asciidoc                              | 1 +
 dev-tools/packaging/templates/docker/Dockerfile.tmpl | 1 +
 2 files changed, 2 insertions(+)

diff --git a/CHANGELOG.next.asciidoc b/CHANGELOG.next.asciidoc
index 00a472dfd956..35f6aebd1f4c 100644
--- a/CHANGELOG.next.asciidoc
+++ b/CHANGELOG.next.asciidoc
@@ -136,6 +136,7 @@ automatic splitting at root level, if root level element is an array. {pull}3415
 - Fix temp dir running out of space with project monitors. {issue}35843[35843]
 - Fixing the grok expression outputs of log files {pull}35221[35221]
 - Enable heartbeat-wide publish timeout setting with run_once. {pull}35721[35721]
+- Added default timezone UTC to heartbeat docker images to fix synthetics journeys navigation errors. {pull}36193[36193]
 
 *Heartbeat*
 
diff --git a/dev-tools/packaging/templates/docker/Dockerfile.tmpl b/dev-tools/packaging/templates/docker/Dockerfile.tmpl
index 3ba9207f077c..305687d33e01 100644
--- a/dev-tools/packaging/templates/docker/Dockerfile.tmpl
+++ b/dev-tools/packaging/templates/docker/Dockerfile.tmpl
@@ -121,6 +121,7 @@ RUN echo \
 
 # Setup synthetics env vars
 ENV ELASTIC_SYNTHETICS_CAPABLE=true
+ENV TZ=UTC
 ENV SUITES_DIR={{ $beatHome }}/suites
 ENV NODE_VERSION=18.16.0
 ENV PATH="$NODE_PATH/node/bin:$PATH"