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Why not use one of the existing monitoring tools?

There are many tools out there that do monitoring in one way or the other. There are complete closed source solutions like New Relic, Splunk and App Dynamics. They bring everything you need, a tool to collect logs or metrics, a database, a UI with dashboards and alerting.

The OSS community likes to break them down into separate tools. For example the ELK-stack consists of Elasticsearch as database and Kibana as the UI. It is usually combined with Logstash or Filebeat for logfile collection.

Another popular UI is Grafana which can be combined with Loki, Prometheus, Graphite or Metrictank (which is an engine for Graphite).

Newer and popular for its good database is the duo InfluxDB + Chronograf.

Apart from the general purpose solutions there are also more specialized tools. For example Nagios/Icinga which specializes in hardware monitoring.

Kibana (ELK), App Dynamics, Graphite (Metrictank), Prometheus, Loki, Grafana, Solarwinds Netflix Atlas, RRDtool, Ganglia, InfluxDB + Chronograf, OpenTSDB, Nagios/Icinga, Sentry, Heka, Bosun, Wavefront, Dropwizard, Druid.io, Bleemo, Site24x7, Datadog, Sitescope, SignalFX, and many more. None of them provides the visualizations we had in mind. We wanted to plot each value of the time series data individually, so that we can identify the response times of a single request. But tools like Splunk, Kibana, Chronograf or Grafana only plot aggregated data (average, min/max, percentiles).