Merge pull request #1187 from matrix-org/paul/metrics-howto

Update documentation about exported prometheus metrics
This commit is contained in:
Paul Evans 2016-10-31 18:33:32 +00:00 committed by GitHub
commit 47ed4d84bb

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@ -15,36 +15,45 @@ How to monitor Synapse metrics using Prometheus
Restart synapse
3: Check out synapse-prometheus-config
https://github.com/matrix-org/synapse-prometheus-config
3: Add a prometheus target for synapse. It needs to set the ``metrics_path``
to a non-default value::
4: Add ``synapse.html`` and ``synapse.rules``
The ``.html`` file needs to appear in prometheus's ``consoles`` directory,
and the ``.rules`` file needs to be invoked somewhere in the main config
file. A symlink to each from the git checkout into the prometheus directory
might be easiest to ensure ``git pull`` keeps it updated.
- job_name: "synapse"
metrics_path: "/_synapse/metrics"
static_configs:
- targets:
"my.server.here:9092"
5: Add a prometheus target for synapse
This is easiest if prometheus runs on the same machine as synapse, as it can
then just use localhost::
Standard Metric Names
---------------------
global: {
rule_file: "synapse.rules"
}
As of synapse version 0.18.2, the format of the process-wide metrics has been
changed to fit prometheus standard naming conventions. Additionally the units
have been changed to seconds, from miliseconds.
job: {
name: "synapse"
================================== =============================
New name Old name
---------------------------------- -----------------------------
process_cpu_user_seconds_total process_resource_utime / 1000
process_cpu_system_seconds_total process_resource_stime / 1000
process_open_fds (no 'type' label) process_fds
================================== =============================
target_group: {
target: "http://localhost:9092/"
}
}
The python-specific counts of garbage collector performance have been renamed.
6: Start prometheus::
=========================== ======================
New name Old name
--------------------------- ----------------------
python_gc_time reactor_gc_time
python_gc_unreachable_total reactor_gc_unreachable
python_gc_counts reactor_gc_counts
=========================== ======================
./prometheus -config.file=prometheus.conf
The twisted-specific reactor metrics have been renamed.
7: Wait a few seconds for it to start and perform the first scrape,
then visit the console:
http://server-where-prometheus-runs:9090/consoles/synapse.html
==================================== =================
New name Old name
------------------------------------ -----------------
python_twisted_reactor_pending_calls reactor_tick_time
python_twisted_reactor_tick_time reactor_tick_time
==================================== =================