maxivak

Sending emails with ActionMailer and Sidekiq

Send email asynchroniously using Sidekiq.

ActionMailer

Create your mailer us usual:

dbkbali

CREATE AGGREGATE vector_sum (
    sfunc = AXH_Vector_Sum,
    basetype = int[],
    stype = int[],
    initcond = '{0}'
);

DROP FUNCTION IF EXISTS AXH_Vector_Sum(int[], int[]);
CREATE OR REPLACE FUNCTION AXH_Vector_Sum(int[], int[]) 
    RETURNS int[] AS $$

ageis

bitcoind-monitor.py

This is a script written in Python intended to run alongside a Bitcoin node and export statistics for monitoring purposes. It assumes the existence of bitcoin-cli in the PATH and access to the RPC interface over localhost.

It tracks stuff like: block height, difficulty, number of peers, network hash rate, errors, uptime in seconds, mempool size, size of recent blocks, number of transactions within blocks, chaintips, total bytes received and sent, and transaction inputs and outputs. These Bitcoin metrics are refreshed once every 5 minutes.

How it works

Prometheus is a monitoring system and time-series database.

limitusus

Problem

Want to create a calculated item with last("X") / last("Y"). When Y = 0, the result should be 0.

Answer

last("X") * (1 - count("Y",#1,0)) / (last("Y") + count("Y",#1,0))