Utility to merge Prometheus textformat files

prometheus-textformat-merge is a command line program to combine multiple Prometheus textformat inputs.

Prometheus' node exporter has a textfile collector reading textformat files in a predetermined directory. When multiple files contain the same metrics, albeit with different labels, collection fails (see also prometheus/node_exporter#1885).

There are other use cases where combining multiple metrics sources is useful, e.g. after downloading them from a collector using cURL.

The following inputs are supported:

• Regular files using the Prometheus text format
• Standard input
• Directories with multiple files with the --dirs flag (enumerates *.prom in the given directories by default)

Example usage

$ cat >first.prom <<'EOF'
# HELP node_disk_io_time_seconds_total Total seconds spent doing I/Os.
# TYPE node_disk_io_time_seconds_total counter
node_disk_io_time_seconds_total{device="dm-0"} 581.412
node_disk_io_time_seconds_total{device="dm-1"} 483.348
EOF

$ cat >second.prom <<'EOF'
# HELP node_load5 5m load average.
# TYPE node_load5 gauge
node_load5 0.42
EOF

$ prometheus-textformat-merge first.prom second.prom
# HELP node_disk_io_time_seconds_total Total seconds spent doing I/Os.
# TYPE node_disk_io_time_seconds_total counter
node_disk_io_time_seconds_total{device="dm-0"} 581.412
node_disk_io_time_seconds_total{device="dm-1"} 483.348
# HELP node_load5 5m load average.
# TYPE node_load5 gauge
node_load5 0.42

Reading from standard input is also supported with the - placeholder:

$ prometheus-textformat-merge --output all.prom first.prom - <<'EOF'
# TYPE node_disk_io_time_seconds_total counter
node_disk_io_time_seconds_total{device="dm-4"} 104.156
node_disk_io_time_seconds_total{device="dm-5"} 0.372
EOF

$ cat all.prom
# HELP node_disk_io_time_seconds_total Total seconds spent doing I/Os.
# TYPE node_disk_io_time_seconds_total counter
node_disk_io_time_seconds_total{device="dm-0"} 581.412
node_disk_io_time_seconds_total{device="dm-1"} 483.348
node_disk_io_time_seconds_total{device="dm-4"} 104.156
node_disk_io_time_seconds_total{device="dm-5"} 0.372

Note how the same metric was combined from multiple sources and written to a file. See the --help output for available flags.

Installation

Pre-built binaries are provided for all releases:

• Binary archives (.tar.gz)
• Debian/Ubuntu (.deb)
• RHEL/Fedora (.rpm)
• Microsoft Windows (*.zip)

With the source being available it's also possible to produce custom builds directly using Go or GoReleaser.