Klibs: add DigitalOcean metrics agent #2007
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This is being done so that macros such as htobe32() and le64toh() can be called from buffer.h (which will be needed in the next commit).
With this change, the buffer.h header file contains all the helper functions to read and write 16-, 32- and 64-bit values in big endian or little endian format; these functions can be used regardless of the endianness of the target architecture.
This new klib implements an agent which, similarly to the DigitalOcean agent at https://github.com/digitalocean/do-agent, collects memory usage metrics (consisting of values for total, free, cached and available memory) and sends them to the DigitalOcean monitoring server. This klib is configured via a "digitalocean" tuple in the manifest options: sending of memory metrics is enabled when this tuple contains a "metrics" tuple. The default interval between two successive metrics data points is 120 seconds; the "metrics" configuration tuple may contain an "interval" option to specify an arbitrary interval value, expressed in seconds. Example snippet of Ops configuration: ``` "ManifestPassthrough": { "digitalocean": { "metrics": {"interval":"180" } } } ``` Note: when the DigitalOcean klib is configured to send memory metrics, CPU and disk I/O metrics are not displayed in the graphs of the DigitalOcean droplet control panel. Closes nanovms/ops#1583
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This new klib implements an agent which, similarly to the DigitalOcean agent at https://github.com/digitalocean/do-agent, collects memory usage metrics (consisting of values for total, free, cached and available memory) and sends them to the DigitalOcean monitoring server.
This klib is configured via a "digitalocean" tuple in the manifest options: sending of memory metrics is enabled when this tuple contains a "metrics" tuple. The default interval between two successive metrics data points is 120 seconds; the "metrics" configuration tuple may contain an "interval" option to specify an arbitrary interval value, expressed in seconds.
Example snippet of Ops configuration:
Note: when the DigitalOcean klib is configured to send memory metrics, CPU and disk I/O metrics are not displayed in the graphs of the DigitalOcean droplet control panel.