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Scylla Monitoring Stack 3.6

The Scylla team is pleased to announce the release of Scylla Monitoring Stack 3.6.

Scylla Monitoring Stack is an open-source stack for monitoring Scylla Enterprise and Scylla Open Source, based on Prometheus and Grafana. Scylla Monitoring Stack 3.6 supports:

  • Scylla Open Source versions 4.1, 4.2 and 4.3
  • Scylla Enterprise versions 2019.x and 2020.x
  • Scylla Manager 2.1.x and 2.2.x

Related Links

New in Scylla Monitoring Stack 3.6

Adding the Advisor section #1162

The Advisor is a new concept in Scylla Monitoring. It identifies potential problems and notifies them. The Advisor section in the Overview dashboard has two parts, one for various issues detected, like unprepared statements. The second is an indication of how balanced the system is. When the cluster works properly, all nodes and shards should act the same. An outlier shard could be a result of a problem. For example, if the number of CQL connections per shard varies between shards, it indicates a driver configuration issue.

Use Loki as data source #1147

Grafana Loki is a log aggregation system inspired by Prometheus. The monitoring stack will use Loki for alert and metrics generation.  Note that it does not act as a centralized monitoring system. In Scylla Monitoring, Loki gets the traces using rsyslog. Make sure to configure the rsyslog client on the Scylla servers.

Add Scylla Open Source 4.3 dashboards #1144

Scylla Monitoring Stack now supports Scylla Open Source 4.3.

New look to the node table #1097

The node tables are part of the Datacenter section in the Overview dashboard. The table is now more organized and more informative.

This is how it looks like when a node joins the cluster

Collapsible rows #973

Collapsible rows are now used in various places on the dashboard. You can open them for additional information.

New Lightweight Transactions (LWT) metrics for the dashboard #936

LWT involved multiple Paxos messages. New panels in the LWT section now show the number of Paxos messages. This gives an insight into the actual traffic involved in the LWT operations.

Easy way to capture the entire dashboard, in one click #248

At the bottom of each dashboard, there are now two buttons, one to report an issue on the page and another to take a snapshot of the dashboard as a download image file.

Support dynamic intervals #957

Many graphs on the dashboards use a rate interval; some activity measured over a period of time. There has been a long discussion in the Grafana community as to which interval to use for a timescale.

In general, when looking at graphs of different time ranges (i.e., last hour vs. last week), the time rate interval should make sense.

Grafana 7.2 came with a dynamic interval to solve this issue. You can read more about it here.

Grafana: Use UTC by default #1065

Time shown in graphs is now displayed in UTC time instead of the browser local time.

Upgrade to Grafana 7.3.5 #1061

Operational Changes

  • Configure rsyslog on the Scylla hosts. Scylla monitoring uses Loki to generate metrics and alerts from logs. It gets the traces from rsyslog. For the full functionality to work, you need an rsyslog agent running on each of the Scylla machines and to add the scylla monitoring as an rsyslog target.
  • Use docker-compose as an optional replacement for start-all.sh #273
  • A command line option to add Prometheus targets  #1197

Bug Fixes

  • Passing --no-loki got illegal option: --error #1152
[27 Jan 2021]