ballerina 学习二十四 监控ballerina

ballerina 服务的监控还是比较方便的，以及集成了Prometheus Grafana Jaeger Elastic Stack

监控服务监控的集成

• 主要包含以下几个步骤

a.  安装docker  Prometheus  Grafana Jaeger Elastic Stack 
b.  创建简单ballerian 服务
c.  监控ballerina 服务（--observe 选项，启动之后，默认会使用使用http endpoint 发送监控指标，同时也可以使用配置文件 ballerian.conf 配置
      ballerina run --config <path-to-conf>/ballerina.conf ballerinaservice
d.  发送一些请求  http://localhost:9090/hello/sayHello
e.  通过dashboard 查看指标信息

Jaeger via http://localhost:16686/ 
Grafana dashboard on http://localhost:3000/
Kibana via http://localhost:5601

• 参考代码

import ballerina/http;
import ballerina/log;

service<http:Service> hello bind { port:9090 } {

    sayHello (endpoint caller, http:Request req) {
        log:printInfo("This is a test Info log");
        log:printError("This is a test Error log");
        log:printWarn("This is a test Warn log");
        http:Response res = new;
        res.setPayload("Hello, World!");
        _ = caller -> respond(res);
    }
}

修改默认配置参考文档

Configuration Key	Description	Default Value	Possible Values
b7a.observability.metrics. enabled	Whether metrics monitoring is enabled (true) or disabled (false)	false	true or false
b7a.observability.metrics. provider	Provider name which implements Metrics interface. This is only required to be modified if a custom provider is implemented and needs to be used.	micrometer	micrometer or if any custom implementation, then name of the provider.
b7a.observability.metrics. micrometer.registry.name	Name of the registry used in micrometer	prometheus	prometheus
b7a.observability.metrics. prometheus.port	The value of the port in which the service '/metrics' will be bind to. This service will be used by Prometheus to scrape the information of the Ballerina service.	9797	Any suitable value for port 0 - 0 - 65535. However, within that range, ports 0 - 1023 are generally reserved for specific purposes, therefore it is advisable to select a port without that range.
b7a.observability.metrics. prometheus.hostname	The hostname in which the service '/metrics' will be bind to. This service will be used by Prometheus to scrape the information of the Ballerina service.	0.0.0.0	IP or Hostname or 0.0.0.0 of the node in which the Ballerina service is running.
b7a.observability.metrics. prometheus.descriptions	This flag indicates whether meter descriptions should be sent to Prometheus. Turn this off to minimize the amount of data sent on each scrape.	false	true or false
b7a.observability.metrics. prometheus.step	The step size to use in computing windowed statistics like max. To get the most out of these statistics, align the step interval to be close to your scrape interval.	PT1M (1 minute)	The formats accepted are based on the ISO-8601 duration format PnDTnHnMn.nS with days considered to be exactly 24 hours.

参考文档

https://ballerina.io/learn/how-to-observe-ballerina-code/