已有 JVM 指标的 Java 应用对接可观测性¶
如果您的 Java 应用通过其他方式（比如 Spring Boot Actuator）暴露了 JVM 的监控指标， 我们需要让监控数据被采集到。您可以通过在工作负载中添加注解（Kubernetes Annotations）的方式让 Insight 来采集已有的 JVM 指标：
annatation:
insight.opentelemetry.io/metric-scrape: "true" # 是否采集
insight.opentelemetry.io/metric-path: "/" # 采集指标的路径
insight.opentelemetry.io/metric-port: "9464" # 采集指标的端口
例如为 my-deployment-app 添加注解：
apiVersion: apps/v1
kind: Deployment
metadata:
name: my-deployment-app
spec:
selector:
matchLabels:
app: my-deployment-app
app.kubernetes.io/name: my-deployment-app
replicas: 1
template:
metadata:
labels:
app: my-deployment-app
app.kubernetes.io/name: my-deployment-app
annotations:
insight.opentelemetry.io/metric-scrape: "true" # 是否采集
insight.opentelemetry.io/metric-path: "/" # 采集指标的路径
insight.opentelemetry.io/metric-port: "9464" # 采集指标的端口
以下是完整示例：
---
apiVersion: v1
kind: Service
metadata:
name: spring-boot-actuator-prometheus-metrics-demo
spec:
type: NodePort
selector:
#app: my-deployment-with-aotu-instrumentation-app
app.kubernetes.io/name: spring-boot-actuator-prometheus-metrics-demo
ports:
- name: http
port: 8080
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: spring-boot-actuator-prometheus-metrics-demo
spec:
selector:
matchLabels:
#app: my-deployment-with-aotu-instrumentation-app
app.kubernetes.io/name: spring-boot-actuator-prometheus-metrics-demo
replicas: 1
template:
metadata:
labels:
app.kubernetes.io/name: spring-boot-actuator-prometheus-metrics-demo
annotations:
insight.opentelemetry.io/metric-scrape: "true" # 是否采集
insight.opentelemetry.io/metric-path: "/actuator/prometheus" # 采集指标的路径
insight.opentelemetry.io/metric-port: "8080" # 采集指标的端口
spec:
containers:
- name: myapp
image: docker.m.daocloud.io/wutang/spring-boot-actuator-prometheus-metrics-demo
ports:
- name: http
containerPort: 8080
resources:
limits:
cpu: 500m
memory: 800Mi
requests:
cpu: 200m
memory: 400Mi
以上示例中，Insight 会通过 :8080//actuator/prometheus 抓取通过 Spring Boot Actuator 暴露出来的 Prometheus 指标。