It is an agent for collecting, processing, aggregating, and writing metrics. Design goals are to have a minimal memory footprint with a plugin system so that developers in the community can easily add support for collecting metrics.
Telegraf is a tool in the Monitoring category of a tech stack.
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What are some alternatives to Telegraf?
Kibana is an open source (Apache Licensed), browser based analytics and search dashboard for Elasticsearch. Kibana is a snap to setup and start using. Kibana strives to be easy to get started with, while also being flexible and powerful, just like Elasticsearch.
Grafana is a general purpose dashboard and graph composer. It's focused on providing rich ways to visualize time series metrics, mainly though graphs but supports other ways to visualize data through a pluggable panel architecture. It currently has rich support for for Graphite, InfluxDB and OpenTSDB. But supports other data sources via plugins.
Prometheus is a systems and service monitoring system. It collects metrics from configured targets at given intervals, evaluates rule expressions, displays the results, and can trigger alerts if some condition is observed to be true.
Nagios is a host/service/network monitoring program written in C and released under the GNU General Public License.
TimescaleDB, HostedMetrics, Graphite, Nightingale, Bleemeo and 1 more are some of the popular tools that integrate with Telegraf. Here's a list of all 6 tools that integrate with Telegraf.