add prometheus makedown

docs/sample/others/prometheus.md

@@ -0,0 +1,111 @@
+# Metric Filter Quick Start
+
+## Start PrometheusPushGateway [Docker environment]:
+
+##### Use Docker to install and start：
+
+ Directly obtain the latest version of the official image `prom/pushgateway:latest` The startup command is as follows:
+
+```shell
+---
+$ docker pull prom/pushgateway
+```
+
+```shell
+---
+$ docker run -d -p 9091:9091 prom/pushgateway
+```
+
+Use the command `./pushgateway` command to start the service. At this time, the browser can access the UI page by accessing `http://<ip>:9091`, but there is no data display on the default Metrics, that is because we have not yet sent to PushGateway Push any data. 
+
+However, the PushGateway service itself comes with some metrics, which can be obtained by visiting the `http://<ip>:9091/metrics` address. You can see that it contains some monitoring metrics related to go and process.
+
+##### Check if the configuration is successful：
+
+PushGateway provides a standard API interface and allows users to add data. The default URL address is: `http://<ip>:9091/metrics/job/<JOBNAME>{/<LABEL_NAME>/<LABEL_VALUE>}`, where `<JOBNAME>` It is a required item, which is the value of the job label. It can be followed by any number of label pairs. Generally, we will add an instance`/<INSTANCE_NAME>` instance name label to facilitate the distinction of each indicator.  Next, you can push a simple indicator data to PushGateway for testing.
+
+```shell
+---
+$ echo "test_metric 123456" | curl --data-binary @- http://<ip>:9091/metrics/job/test_job
+```
+
+After the execution is complete, refresh the PushGateway UI page to verify that you can see the test_metric indicator data you just added.
+
+It can also be tested in the following way:
+```shell
+---
+$ cat <<EOF | curl --data-binary @- http://<ip>:9091/metrics/job/test_job/instance/test_instance
+# TYPE test_metrics counter
+test_metrics{label="app1",name="demo"} 100.00
+# TYPE another_test_metrics gauge
+# HELP another_test_metrics Just an example.
+another_test_metrics 123.45
+EOF
+```
+
+## Start Pixiu:
+
+Examples of official references is in `https://github.com/dubbo-go-pixiu/samples`
+
+Add the following configuration file to the `samples/http/simple/pixiu/conf.yaml`
+
+```yaml
+---
+static_resources:
+  listeners:
+    - name: "net/http"
+      protocol_type: "HTTP"
+      address:
+        socket_address:
+          address: "0.0.0.0"
+          port: 8888
+      filter_chains:
+        filters:
+          - name: dgp.filter.httpconnectionmanager
+            config:
+              route_config:
+                routes:
+                  - match:
+                      prefix: /user
+                    route:
+                      cluster: user
+                      cluster_not_found_response_code: 505
+                http_filters:
+                - name: dgp.filter.http.prometheusmetric
+                  metric_collect_rules:
+                    enable: true
+                    metric_path: "/metrics"
+                    push_gateway_url: "http://127.0.0.1:9091"
+                    push_interval_seconds: 3
+                    push_job_name: "prometheus"
+      config:
+        idle_timeout: 5s
+        read_timeout: 5s
+        write_timeout: 5s
+  clusters:
+    - name: "user"
+      lb_policy: "lb"
+      endpoints:
+        - id: 1
+          socket_address:
+            address: 127.0.0.1
+            port: 1314
+      health_checks:
+        - protocol: "tcp"
+          timeout: 1s
+          interval: 2s
+          healthy_threshold: 4
+          unhealthy_threshold: 4
+  shutdown_config:
+    timeout: "60s"
+    step_timeout: "10s"
+    reject_policy: "immediacy"
+```
+
+Then execute the following command .
+
+```shell
+---
+go run cmd/pixiu/*.go gateway start -c samples/http/simplep/pixiu/conf.yaml
+```
+Then you can also query the collected indicator data on the PushGateway UI page .