Once you send metric data to New Relic via the Metric API, the dtaa is available for querying with NRQL. This document contains metric functions, examples, and sample queries.
View and query your metrics
FROM Metric SELECT function(metric_name) WHERE attribute=value FACET attribute TIMESERIES
Below are the functions supported for each metric type:
|Metric type||Supported functions|
count, sum, min, max, and average
count, sum, min, max, average, and latest
Add the names of the metrics you want to chart with the appropriate value functions in the
SELECT clause. The
FACET clauses can be used with attribute values. Remember to include the keyword
TIMESERIES if you want to chart the data.
This example demonstrates how you could chart the CPU usage in seconds for cluster
foo . This query breaks down CPU usage by container, given a
count metric named
container_cpu_usage_seconds_total with the attributes
FROM Metric select sum(container_cpu_usage_seconds_total) WHERE clusterName = 'foo' FACET containerName TIMESERIES
If you want the CPU usage per minute (the rate of change), then you can add the rate function to the query above.
FROM Metric select rate(sum(container_cpu_usage_seconds_total), 1 minute) WHERE clusterName = 'foo' FACET containerName TIMESERIES
Example metric queries
The previous examples demonstrate basic forms of metric queries; but NRQL can also be used to chart, explore, and analyze your metric data.
- Chart multiple metrics
Chart multiple metrics using a single query by providing a comma-separated list of metrics in the
SELECTclause. For example, to chart the memory usage for a container along with the memory limit metric, use the following query:
FROM Metric SELECT latest(container_memory_usage_bytes), latest(container_spec_memory_limit_bytes) WHERE containerName = 'inventory' TIMESERIES
- Perform mathematical operations on metric data
Perform math operations on one or more metrics to compute a new, derived metric. To monitor available memory, you can calculate the percentage of available memory from the two metrics used in the previous example:
FROM Metric SELECT (latest(container_spec_memory_limit_bytes) - latest(container_memory_usage_bytes)) / latest(container_spec_memory_limit_bytes) * 100 AS '% Memory Available' WHERE containerName = 'inventory' TIMESERIES
- Use filters to select specific time series
In addition to using a
WHEREclause which applies to everything in
SELECT, NRQL provides another aggregation function called
filterwhich can be used to select a specific time series to be charted or operated on. In the following example query, we chart a memory usage metric labeled
"Total (k8s)"which is computed by adding together the memory usage of two specific containers within a pod:
FROM Metric SELECT filter( latest( container_memory_usage_bytes), WHERE containerName = 'discovery') + filter( latest( container_memory_usage_bytes), WHERE containerName = 'istio-proxy') AS 'Total (k8s)' WHERE clusterName = 'my-cluster' AND podName LIKE 'istio-pilot-%' TIMESERIES
- View the raw metric data points
When querying metric data using
FROM Metric, New Relic automatically selects the specific aggregate to use in the query, depending on the length of the query window and any bucket size specified as an argument to the
TIMESERIESkeyword. This ensures efficient querying and chart resolution. If you want to override this behavior to view or operate on the raw metric data points, use the optional
RAWkeyword in your query.
This example shows how to list the last 20 data points received for a particular metric:
FROM Metric SELECT * WHERE metricName = 'container_fs_usage_bytes' LIMIT 20 RAW
Explore your metric data
uniques functions can be used together with the
metricName attribute (available on all metrics) to perform tasks like listing all the available metrics in your account or discovering the attributes available on a particular metric.
- List all metric names in an account
FROM Metric SELECT uniques(metricName)
- List all metric names for a particular host
FROM Metric SELECT uniques(metricName) WHERE hostname = 'host1.mycompany.com'
- Show the attribute keys for a specific metric
FROM Metric SELECT keyset() WHERE metricName = METRIC_NAME