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-rw-r--r--doc/administration/monitoring/performance/index.md11
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diff --git a/doc/administration/monitoring/performance/index.md b/doc/administration/monitoring/performance/index.md
index 5b82696ae4b..072baa16e29 100644
--- a/doc/administration/monitoring/performance/index.md
+++ b/doc/administration/monitoring/performance/index.md
@@ -61,3 +61,14 @@ half above the interval. For example, for a user defined interval of 15 seconds
the actual interval can be anywhere between 7.5 and 22.5. The interval is
re-generated for every sampling run instead of being generated one time and reused
for the duration of the process' lifetime.
+
+User defined intervals can be specified by means of environment variables.
+The following environment variables are recognized:
+
+- `RUBY_SAMPLER_INTERVAL_SECONDS`
+- `DATABASE_SAMPLER_INTERVAL_SECONDS`
+- `ACTION_CABLE_SAMPLER_INTERVAL_SECONDS`
+- `PUMA_SAMPLER_INTERVAL_SECONDS`
+- `UNICORN_SAMPLER_INTERVAL_SECONDS`
+- `THREADS_SAMPLER_INTERVAL_SECONDS`
+- `GLOBAL_SEARCH_SAMPLER_INTERVAL_SECONDS`