const apmClient = require('elastic-apm-node');
const apmUtils = require('elastic-apm-utils');

apmUtils.apm.useConstrainedResources();
apmClient.start({});

apmUtils.apm.useConstrainedMemory()

Alias for apmUtils.apm.useConstrainedResources().

apmUtils.apm.spanFilter({ filterShorterThan })

Filters spans.

apmClient.addSpanFilter(apmUtils.apm.spanFilter({
    // remove spans shorter than this value in ms
    filterShorterThan: 10,
}));

apmUtils.apm.addTransactionFilter({ keepRequest, keepResponse, keepSocket })

Filters request and response properties.

apmClient.transactionFilter(apmUtils.apm.transactionFilter({
    // completely remove non-sampled transactions
    // (otherwise those are still sent to APM, just with less details)
    filterNotSampled: true,
    
    // list of request headers to keep, optional
    keepRequest: [ 'referer', 'user-agent' ], 

    // list of response headers to keep, optional
    keepResponse: [], 

    // list of socket properties to keep, optional
    keepSocket: [], 
}));

Express integration

apmUtils.express.middleware(apmClient, { setAddress, setOrigin })

Returns an express middleware.

server.use(apmUtils.express.middleware(apmCient, {
    // set remote IP address as a tag to allow filtering in Kibana
    setAddress: true,
    
    // set request origin / referrer hostname as a tag to allow filtering in Kibana
    setOrigin: true,
}));

Koa integration

apmUtils.koa.middleware(apmClient, { prefix, setAddress, setOrigin, setRouteName })

Returns a koa middleware.

router.use(apmUtils.koa.middleware(apmCient, {
    // a prefix for all transaction names, only used if setRouteName = true
    prefix: '',
    
    // set remote IP address as a tag to allow filtering in Kibana
    setAddress: true,
    
    // set request origin / referrer hostname as a tag to allow filtering in Kibana
    setOrigin: true,
    
    // more accurate route names when using koa-router
    setRouteName: true,
}));