[lucene-solr] branch branch_7x updated: SOLR-13234: Adding CHANGES.txt entry under 7.8.0 section

[sh...@apache.org]

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shalin pushed a commit to branch branch_7x
in repository https://gitbox.apache.org/repos/asf/lucene-solr.git


The following commit(s) were added to refs/heads/branch_7x by this push:
     new 9f9d65d  SOLR-13234: Adding CHANGES.txt entry under 7.8.0 section
9f9d65d is described below

commit 9f9d65d6ec9b54bf903702620c41acc75b481809
Author: Shalin Shekhar Mangar <sh...@apache.org>
AuthorDate: Tue Mar 5 10:10:47 2019 +0530

    SOLR-13234: Adding CHANGES.txt entry under 7.8.0 section
---
 solr/CHANGES.txt | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/solr/CHANGES.txt b/solr/CHANGES.txt
index 7bac0c7..3254f0d 100644
--- a/solr/CHANGES.txt
+++ b/solr/CHANGES.txt
@@ -28,8 +28,23 @@ Velocity 1.7 and Velocity Tools 2.0
 Apache ZooKeeper 3.4.13
 Jetty 9.4.14.v20181114
 
+Upgrade Notes
+----------------------
 
-(No Changes)
+* SOLR-13234: The Prometheus Metric Exporter now collects metrics from Solr at a fixed schedule that is controlled
+  by the exporter itself. The default interval is 60s but it can be changed by specifying the --scrape-interval
+  command line parameter to the tool. The collected metrics are cached and returned for any requests coming in before
+  the next scheduled collection. This can impact the freshness of the metrics if prometheus is configured to query the
+  tool more frequently.
+
+Bug fixes
+----------------------
+
+* SOLR-13234: Prometheus Metric Exporter not threadsafe. This changes the prometheus exporter to collect metrics
+  from Solr on a fixed interval controlled by this tool and prevents concurrent collections. This change also improves
+  performance slightly by using the cluster state instead of sending multiple HTTP requests to each node to lookup
+  all the cores.
+  (Danyal Prout via shalin)
 
 ==================  7.7.1 ==================