From 548dd7b88bb2cce0cac29f4e6ce920d30eedfdc1 Mon Sep 17 00:00:00 2001
From: Andrew Wilkins <axw@elastic.co>
Date: Thu, 11 Feb 2021 15:45:26 +0800
Subject: [PATCH] Cross-reference sampling/pubsub and apmpackage

---
 .../apm/0.1.0/data_stream/sampled_traces/fields/fields.yml     | 2 ++
 x-pack/apm-server/sampling/pubsub/datastream.go                | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/apmpackage/apm/0.1.0/data_stream/sampled_traces/fields/fields.yml b/apmpackage/apm/0.1.0/data_stream/sampled_traces/fields/fields.yml
index cbef8c0da6e..370b8752662 100644
--- a/apmpackage/apm/0.1.0/data_stream/sampled_traces/fields/fields.yml
+++ b/apmpackage/apm/0.1.0/data_stream/sampled_traces/fields/fields.yml
@@ -1,3 +1,5 @@
+# When changing fields or ILM policy, make sure to update
+# x-pack/apm-server/sampling/pubsub/datastream.go.
 - name: observer.id
   type: keyword
   description: |
diff --git a/x-pack/apm-server/sampling/pubsub/datastream.go b/x-pack/apm-server/sampling/pubsub/datastream.go
index aad7859a8c9..016848cb0a6 100644
--- a/x-pack/apm-server/sampling/pubsub/datastream.go
+++ b/x-pack/apm-server/sampling/pubsub/datastream.go
@@ -58,6 +58,9 @@ func SetupDataStream(
 	return nil
 }
 
+// NOTE(axw) these replicate the index template and ILM policy created by Fleet,
+// and should be kept in sync with apmpackage/apm/.../data_stream/sampled_traces.
+
 const ilmPolicy = `{
   "policy": {
     "phases": {