Logstash API Monitor

Logstash 5.0 开始，提供了输出自身进程的指标和状态监控的 API。

官方文档：
https://www.elastic.co/guide/en/logstash/current/monitoring-logstash.html#monitoring

Node Info API
https://www.elastic.co/guide/en/logstash/current/node-info-api.html
pipeline Gets pipeline-specific information and settings.
os Gets node-level info about the OS.
jvm Gets node-level JVM info, including info about threads.

curl -s ‘localhost:9600/_node/pipeline’?pretty
curl -s ‘localhost:9600/_node/os’?pretty
curl -s ‘localhost:9600/_node/jvm’?pretty

Plugins Info API
https://www.elastic.co/guide/en/logstash/current/plugins-api.html
curl -s ‘localhost:9600/_node/plugins?pretty’

Node Stats API
https://www.elastic.co/guide/en/logstash/current/node-stats-api.html

jvm Gets JVM stats, including stats about threads, memory usage, garbage collectors, and uptime.
process Gets process stats, including stats about file descriptors, memory consumption, and CPU usage.
pipeline Gets runtime stats about the Logstash pipeline.
reloads Gets runtime stats about config reload successes and failures.
os Gets runtime stats about cgroups when Logstash is running in a container.

curl -s localhost:9600/_node/stats/jvm?pretty
curl -s localhost:9600/_node/stats/process?pretty
curl -s localhost:9600/_node/stats/pipeline?pretty
curl -s localhost:9600/_node/stats/reloads?pretty
curl -s localhost:9600/_node/stats/os?pretty

Hot Threads API
https://www.elastic.co/guide/en/logstash/current/hot-threads-api.html
The parameters allowed are:
threads The number of hot threads to return. The default is 3.
human If true, returns plain text instead of JSON format. The default is false.
ignore_idle_threads If true, does not return idle threads. The default is true.

curl -s localhost:9600/_node/hot_threads?pretty
curl -s localhost:9600/_node/hot_threads?human=true&threads=1