This repository contains a sidecar for the Prometheus server that can send metrics to Stackdriver. This is based on this design.
Custom metrics are a chargeable feature of Stackdriver Monitoring and there could be costs for your custom metrics. For more information on pricing, see Stackdriver Pricing.
To install the sidecar on a local machine run:
go get github.com/Stackdriver/stackdriver-prometheus-sidecar/...
The sidecar is deployed next to an already running Prometheus server. It can stream sample data into Stackdriver that is associated with a Kubernetes target in Prometheus.
The following information must be provided:
GCP_PROJECT: The ID of the GCP project the data is written to.WAL_DIR: the./waldirectory within Prometheus's data directory.API_ADDRESS: Prometheus's API address, typically127.0.0.1:9090like the defaultREGION: a valid GCP or AWS region with which the Stackdriver monitored resources are associated. Maps to the resource'slocationlabel (sometimes also calledregion).CLUSTER: a custom name for the monitored Kubernetes cluster. Maps to the monitored resource'scluster_namelabel.
stackdriver-prometheus-sidecar \
--stackdriver.project-id=${GCP_PROJECT} \
--prometheus.wal-directory=${WAL_DIR} \
--prometheus.api-address=${API_ADDRESS} \
--stackdriver.kubernetes.location=${REGION} \
--stackdriver.kubernetes.cluster-name=${CLUSTER}
The sidecar requires write access to the directory to store its progress between restarts.
If your Prometheus server itself is running inside of Kubernetes, the example Kubernetes setup can be used as a reference for setup.
The majority of configuration options for the sidecar are set through flags. To see all available flags, run:
stackdriver-prometheus-sidecar --help
The --include flag allows to provide filters which all series have to pass before being sent to Stackdriver. Filters use the same syntax as Prometheus instant vector selectors, e.g.:
stackdriver-prometheus-sidecar --include='{__name__!~"cadvisor_.+",job="k8s"}' ...
This drops all series which do not have a job label k8s and all metrics that have a name starting with cadvisor_.
For equality filter on metric name you can use the simpler notation, e.g. --include='metric_name{label="foo"}'.
The flag may be repeated to provide several sets of filters, in which case the metric will be forwarded if it matches at least one of them. Please note that inclusion filters only apply to Prometheus metrics proxied directly, and do not apply to aggregated counters.
The sidecar can also be provided with a configuration file. It allows to define static metric renames and to overwrite metric metadata which is usually provided by Prometheus. A configuration file should not be required for the majority of users.
metric_renames:
- from: original_metric_name
to: new_metric_name
# - ...
static_metadata:
- metric: some_metric_name
type: counter # or gauge/histogram
value_type: double # or int64
help: an arbitrary help string
# - ...- All
static_metadataentries must havetypespecified. This specifies the Stackdriver metric type and overrides the metric type chosen by the Prometheus client. - If
value_typeis specified, it will override the default value type for counters and gauges. All Prometheus metrics have a default type of double.
Counter Aggregator is an advanced feature of the sidecar that can be used to export a sum of multiple Prometheus counters to Stackdriver as a single CUMULATIVE metric.
You might find this useful if you have counter metrics in Prometheus with high cardinality labels (or perhaps just counters exported by a large number of targets) which makes exporting all of them to Stackdriver directly too expensive, however you would like to have a cumulative metric that has the sum of those counters.
Aggregated counters are configured in the aggregated_counters block of the configuration file. For example:
aggregated_counters:
- metric: network_transmit_bytes
help: total number of bytes sent over eth0
filters:
- 'node_network_transmit_bytes_total{device="eth0"}'
- 'node_network_transmit_bytes{device="eth0"}'In this example, the sidecar will export a new counter network_transmit_bytes, which will correspond to the total number of bytes transmitted over 'eth0' interface across all machines monitored by Prometheus. Counter Aggregator keeps track of all counters matching the filters and correctly handles counter resets. Like all internal metrics exported by the sidecar, the aggregated counter is exported using OpenCensus and will be available in Stackdriver as a custom metric (custom.googleapis.com/opencensus/network_transmit_bytes).
A list of Prometheus instant vector selectors is expected in the filters field. A time series needs to match any of the specified selectors to be included in the aggregated counter.
Please note that by default metrics that match one of aggregated counter filters will still be exported to Stackdriver unless you have inclusion filters configured that prevent those metrics from being exported (see --include). Using --include to prevent a metric from being exported to Stackdriver does not prevent the metric from being covered by aggregated counters.
When using Counter Aggregator you would usually want to configure a restrictive inclusion filter to avoid raw metrics from being exported to Stackdriver.
The matrix below lists the versions of Prometheus Server and other dependencies that have been qualified to work with releases of stackdriver-prometheus-sidecar. If the matrix does not list whether they are compatible, please assume they are not verified yet. Feel free to contribute to the matrix if you have run the end-to-end test between a version of stackdriver-prometheus-sidecar and Prometheus server.
| sidecar version | Prometheus 2.5.x | Prometheus 2.6.x | Prometheus 2.7.x ~ 2.10.x | Prometheus 2.11.x | Prometheus 2.12+ |
|---|---|---|---|---|---|
| 0.5.x | ✗ | ✓ | ? | ✓ | ? |
| 0.6.x | ✗ | ? | ? | ✓ | ? |
- ✓: Verified as compatible.
- ✗: Verified as incompatible.
- ?: Not verified yet.
Google develops stackdriver-prometheus primarily for Stackdriver users and gives support to Stackdriver users. We designed the user experience to meet the expectations of Prometheus users and to make it easy to run with Prometheus server. stackdriver-prometheus is intended to monitor all your applications, Kubernetes and beyond.
Google develops prometheus-to-sd primarily for Google Kubernetes Engine to collect metrics from system services in order to support Kubernetes users. We designed the tool to be lean when deployed as a sidecar in your pod. It's intended to support only the metrics the Kubernetes team at Google needs; you can use it to monitor your applications, but the user experience could be rough.
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